diff --git a/functions/.eslintrc.js b/functions/.eslintrc.js
new file mode 100644
index 0000000..16b4624
--- /dev/null
+++ b/functions/.eslintrc.js
@@ -0,0 +1,28 @@
+module.exports = {
+  env: {
+    es6: true,
+    node: true,
+  },
+  parserOptions: {
+    "ecmaVersion": 2018,
+  },
+  extends: [
+    "eslint:recommended",
+    "google",
+  ],
+  rules: {
+    "no-restricted-globals": ["error", "name", "length"],
+    "prefer-arrow-callback": "error",
+    "quotes": ["error", "double", {"allowTemplateLiterals": true}],
+  },
+  overrides: [
+    {
+      files: ["**/*.spec.*"],
+      env: {
+        mocha: true,
+      },
+      rules: {},
+    },
+  ],
+  globals: {},
+};
\ No newline at end of file
diff --git a/functions/eslint.config.js b/functions/eslint.config.js
new file mode 100644
index 0000000..b007372
--- /dev/null
+++ b/functions/eslint.config.js
@@ -0,0 +1,24 @@
+const globals = require("globals");
+const js = require("@eslint/js");
+
+module.exports = [
+  js.configs.recommended,
+  {
+    files: ["**/*.js"],
+    languageOptions: {
+      ecmaVersion: 2018,
+      sourceType: "commonjs",
+      globals: {
+        ...globals.node
+      }
+    },
+    rules: {
+      "quotes": ["error", "double"],
+      "max-len": ["error", {"code": 120}],
+      "indent": ["error", 2],
+      "comma-dangle": ["error", "only-multiline"],
+      "camelcase": "error",
+      "no-unused-vars": "warn"
+    }
+  }
+]; 
\ No newline at end of file
diff --git a/functions/index.js b/functions/index.js
index 5c15131..2a930c6 100644
--- a/functions/index.js
+++ b/functions/index.js
@@ -1,33 +1,69 @@
-/**
- * Import function triggers from their respective submodules:
- *
- * const {onCall} = require("firebase-functions/v2/https");
- * const {onDocumentWritten} = require("firebase-functions/v2/firestore");
- *
- * See a full list of supported triggers at https://firebase.google.com/docs/functions
- */
 const v2 = require("firebase-functions/v2");
 const vertexAIApi = require("@google-cloud/vertexai");
+const admin = require("firebase-admin");
 
-// Create and deploy your first functions
-// https://firebase.google.com/docs/functions/get-started
+admin.initializeApp();
 
-const project = 'proj-atc';
-const location = 'us-central1';
-const textModel =  'gemini-1.5-flash';
-const visionModel = 'gemini-1.0-pro-vision';
-
-const vertexAI = new vertexAIApi.VertexAI({project: project, location: location});
+const project = "proj-atc";
+const location = "us-central1";
+const textModel = "gemini-1.5-flash";
+// const visionModel = 'gemini-1.0-pro-vision';
+async function saveNewLanguageCode(languagesCollection, detectedLanguage, languages) {
+  if (detectedLanguage && !languages.includes(detectedLanguage)) {
+    console.log(`Adding new language code: ${detectedLanguage}`);
+    try {
+      await languagesCollection.add({ code: detectedLanguage });
+      console.log("Successfully added new language code to database");
+      return true;
+    } catch (error) {
+      console.error("Error adding new language code to database:", error);
+      return false;
+    }
+  }
+  return false;
+}
+const vertexAI = new vertexAIApi.VertexAI({ project: project, location: location });
 
-const generativeVisionModel = vertexAI.getGenerativeModel({
-    model: visionModel,
-});
+// const generativeVisionModel = vertexAI.getGenerativeModel({
+//     model: visionModel,
+// });
 
 const generativeModelPreview = vertexAI.preview.getGenerativeModel({
-    model: textModel,
+  model: textModel,
 });
 
-const generationConfig = {
+// use onDocumentWritten here to prepare for "edit message" feature later
+exports.onChatWritten = v2.firestore.onDocumentWritten("/public/{messageId}", async (event) => {
+  const document = event.data.after.data();
+  const message = document["message"];
+  console.log(`message: ${message}`);
+
+  // no message? do nothing
+  if (message == undefined) {
+    return;
+  }
+  const curTranslated = document["translated"];
+
+  // check if message is translated
+  if (curTranslated != undefined) {
+    // message was translated before, 
+    // check the original message
+    const original = curTranslated["original"];
+
+    console.log("Original: ", original);
+    // message is same as original, meaning it's already translated. Do nothing
+    if (message == original) {
+      return;
+    }
+  }
+  // Get list of languages from Firestore
+  const db = admin.firestore();
+  const languagesCollection = db.collection("languages");
+  const languagesSnapshot = await languagesCollection.get();
+  const languages = languagesSnapshot.docs.map((e) => e.data().code);
+  console.log("Current languages in database:", languages);
+
+  const generationConfig = {
     temperature: 1,
     topP: 0.95,
     topK: 64,
@@ -35,61 +71,70 @@ const generationConfig = {
     responseMimeType: "application/json",
     responseSchema: {
       type: "object",
-      properties: {
-        en: {
-          type: "string"
-        }
+      properties:
+      {
+        "detectedLanguage": {
+          type: "string",
+          description: "The ISO 639-1 language code that was detected",
+          pattern: "^[a-z]{2}$"
+        },
+        "translation": languages.reduce((acc, lang) => {
+          acc[lang] = { type: "string" };
+          return acc;
+        }, {}),
       },
-      required: [
-        "en"
-      ]
+      required: ["detectedLanguage", "translation"]
     },
   };
-  
-// use onDocumentWritten here to prepare to "edit message" feature later
-exports.onChatWritten = v2.firestore.onDocumentWritten("/public/{messageId}",async (event) => {
-    const document = event.data.after.data();
-    const message = document["message"];
-    console.log(`message: ${message}`);
+  const translateSession = generativeModelPreview.startChat({
+    generateContentConfig: generationConfig,
+  });
 
-    // no message? do nothing
-    if (message == undefined) {
-        return;
-    }
-    const curTranslated = document["translated"];
+  const result = await translateSession.sendMessage(`
+    The target languages: ${languages.join(", ")}.
+    The input text: "${message}". You must do:
+    1. detect language of the input text.
+Only return the language code that is in ISO 639-1 format. 
+If you can't detect the language, return "und" as value of "detectedLanguage" field.
+    2. If the target languages are not empty and the detected language is not "und", 
+       translate the input text to target languages, ignore language that is identical to the detected language. 
+       Else, return null as value of "translation" field.
+        Example: Translate "Chào" to ["ja", "en", "vi"]:
+        {
+          "detectedLanguage": "vi",
+          "translation": {"ja": "こんにちは", "en": "Hello"},
+        }
+        `
+  );
 
-    // check if message is translated
-    if (curTranslated != undefined) {
-        // message is translated before, 
-        // check the original message
-        const original = curTranslated["original"];
+  const response = result.response;
+  console.log("Response:", JSON.stringify(response));
 
-        console.log('Original: ', original);
-        // message is same as original, meaning it's already translated. Do nothing
-        if (message == original) {
-            return;
-        }
-    }
+  const responseContent = response.candidates[0].content;
+  let translationData = null;
+  let detectedLanguage = null;
 
-    const chatSession = generativeModelPreview.startChat({
-        generationConfig: generationConfig
-    });
-    const result = await chatSession.sendMessage(`translate this text to English: ${message}`);
-    const response = result.response;
-    console.log('Response:', JSON.stringify(response));
+  try {
+    // Extract JSON from text part (remove markdown ``` characters)
+    const jsonText = responseContent.parts[0].text.replace(/```json\n|\n```/g, "");
+    translationData = JSON.parse(jsonText);
+    detectedLanguage = translationData.detectedLanguage;
+    console.log("Detected language:", detectedLanguage);
+    console.log("Translation data:", translationData.translation);
+  } catch (error) {
+    console.error("Error parsing translation response:", error);
+  }
 
-    const jsonTranslated = response.candidates[0].content.parts[0].text;
-    console.log('translated json: ', jsonTranslated);
-    // parse this json to get translated text out
-    const translated = JSON.parse(jsonTranslated);
-    console.log('final result: ', translated.en);
+  // Save new language if detected
+  if (detectedLanguage && detectedLanguage !== "und") {
+    await saveNewLanguageCode(languagesCollection, detectedLanguage, languages);
+  }
 
-    // write to message
-    const data = event.data.after.data();
-    return event.data.after.ref.set({
-        'translated': {
-            'original':message,
-            'en': translated.en
-        }
-    }, {merge: true});
-})
\ No newline at end of file
+  // Update document with translation
+  return event.data.after.ref.set({
+    "translated": {
+      "original": message,
+      ...translationData.translation
+    }
+  }, { merge: true });
+});
diff --git a/functions/package-lock.json b/functions/package-lock.json
index 24e01b4..4c6f85b 100644
--- a/functions/package-lock.json
+++ b/functions/package-lock.json
@@ -11,7 +11,10 @@
         "firebase-functions": "^5.0.0"
       },
       "devDependencies": {
-        "firebase-functions-test": "^3.1.0"
+        "@eslint/js": "^9.0.0",
+        "eslint": "^9.20.1",
+        "firebase-functions-test": "^3.1.0",
+        "globals": "^15.0.0"
       },
       "engines": {
         "node": "18"
@@ -691,6 +694,17 @@
         }
       }
     },
+    "node_modules/@babel/traverse/node_modules/globals": {
+      "version": "11.12.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-11.12.0.tgz",
+      "integrity": "sha512-WOBp/EEGUiIsJSp7wcv/y6MO+lV9UoncWqxuFfm8eBwzWNgyfBd6Gz+IeKQ9jCmyhoH99g15M3T+QaVHFjizVA==",
+      "dev": true,
+      "license": "MIT",
+      "peer": true,
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/@babel/traverse/node_modules/ms": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
@@ -723,6 +737,230 @@
       "license": "MIT",
       "peer": true
     },
+    "node_modules/@eslint-community/eslint-utils": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.4.1.tgz",
+      "integrity": "sha512-s3O3waFUrMV8P/XaF/+ZTp1X9XBZW1a4B97ZnjQF2KYWaFD2A8KyFBsrsfSjEmjn3RGWAIuvlneuZm3CUK3jbA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "eslint-visitor-keys": "^3.4.3"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      },
+      "peerDependencies": {
+        "eslint": "^6.0.0 || ^7.0.0 || >=8.0.0"
+      }
+    },
+    "node_modules/@eslint-community/eslint-utils/node_modules/eslint-visitor-keys": {
+      "version": "3.4.3",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-3.4.3.tgz",
+      "integrity": "sha512-wpc+LXeiyiisxPlEkUzU6svyS1frIO3Mgxj1fdy7Pm8Ygzguax2N3Fa/D/ag1WqbOprdI+uY6wMUl8/a2G+iag==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
+    "node_modules/@eslint-community/regexpp": {
+      "version": "4.12.1",
+      "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.12.1.tgz",
+      "integrity": "sha512-CCZCDJuduB9OUkFkY2IgppNZMi2lBQgD2qzwXkEia16cge2pijY/aXi96CJMquDMn3nJdlPV1A5KrJEXwfLNzQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^12.0.0 || ^14.0.0 || >=16.0.0"
+      }
+    },
+    "node_modules/@eslint/config-array": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.19.2.tgz",
+      "integrity": "sha512-GNKqxfHG2ySmJOBSHg7LxeUx4xpuCoFjacmlCoYWEbaPXLwvfIjixRI12xCQZeULksQb23uiA8F40w5TojpV7w==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@eslint/object-schema": "^2.1.6",
+        "debug": "^4.3.1",
+        "minimatch": "^3.1.2"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@eslint/config-array/node_modules/debug": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.0.tgz",
+      "integrity": "sha512-6WTZ/IxCY/T6BALoZHaE4ctp9xm+Z5kY/pzYaCHRFeyVhojxlrm+46y68HA6hr0TcwEssoxNiDEUJQjfPZ/RYA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ms": "^2.1.3"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@eslint/config-array/node_modules/ms": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@eslint/core": {
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/@eslint/core/-/core-0.11.0.tgz",
+      "integrity": "sha512-DWUB2pksgNEb6Bz2fggIy1wh6fGgZP4Xyy/Mt0QZPiloKKXerbqq9D3SBQTlCRYOrcRPu4vuz+CGjwdfqxnoWA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@types/json-schema": "^7.0.15"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@eslint/eslintrc": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-3.2.0.tgz",
+      "integrity": "sha512-grOjVNN8P3hjJn/eIETF1wwd12DdnwFDoyceUJLYYdkpbwq3nLi+4fqrTAONx7XDALqlL220wC/RHSC/QTI/0w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ajv": "^6.12.4",
+        "debug": "^4.3.2",
+        "espree": "^10.0.1",
+        "globals": "^14.0.0",
+        "ignore": "^5.2.0",
+        "import-fresh": "^3.2.1",
+        "js-yaml": "^4.1.0",
+        "minimatch": "^3.1.2",
+        "strip-json-comments": "^3.1.1"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
+    "node_modules/@eslint/eslintrc/node_modules/argparse": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
+      "integrity": "sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q==",
+      "dev": true,
+      "license": "Python-2.0"
+    },
+    "node_modules/@eslint/eslintrc/node_modules/debug": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.0.tgz",
+      "integrity": "sha512-6WTZ/IxCY/T6BALoZHaE4ctp9xm+Z5kY/pzYaCHRFeyVhojxlrm+46y68HA6hr0TcwEssoxNiDEUJQjfPZ/RYA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ms": "^2.1.3"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@eslint/eslintrc/node_modules/globals": {
+      "version": "14.0.0",
+      "resolved": "https://registry.npmjs.org/globals/-/globals-14.0.0.tgz",
+      "integrity": "sha512-oahGvuMGQlPw/ivIYBjVSrWAfWLBeku5tpPE2fOPLi+WHffIWbuh2tCjhyQhTBPMf5E9jDEH4FOmTYgYwbKwtQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/@eslint/eslintrc/node_modules/js-yaml": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-4.1.0.tgz",
+      "integrity": "sha512-wpxZs9NoxZaJESJGIZTyDEaYpl0FKSA+FB9aJiyemKhMwkxQg63h4T1KJgUGHpTqPDNRcmmYLugrRjJlBtWvRA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "argparse": "^2.0.1"
+      },
+      "bin": {
+        "js-yaml": "bin/js-yaml.js"
+      }
+    },
+    "node_modules/@eslint/eslintrc/node_modules/ms": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@eslint/js": {
+      "version": "9.20.0",
+      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-9.20.0.tgz",
+      "integrity": "sha512-iZA07H9io9Wn836aVTytRaNqh00Sad+EamwOVJT12GTLw1VGMFV/4JaME+JjLtr9fiGaoWgYnS54wrfWsSs4oQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@eslint/object-schema": {
+      "version": "2.1.6",
+      "resolved": "https://registry.npmjs.org/@eslint/object-schema/-/object-schema-2.1.6.tgz",
+      "integrity": "sha512-RBMg5FRL0I0gs51M/guSAj5/e14VQ4tpZnQNWwuDT66P14I43ItmPfIZRhO9fUVIPOAQXU47atlywZ/czoqFPA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@eslint/plugin-kit": {
+      "version": "0.2.5",
+      "resolved": "https://registry.npmjs.org/@eslint/plugin-kit/-/plugin-kit-0.2.5.tgz",
+      "integrity": "sha512-lB05FkqEdUg2AA0xEbUz0SnkXT1LcCTa438W4IWTUh4hdOnVbQyOJ81OrDXsJk/LSiJHubgGEFoR5EHq1NsH1A==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@eslint/core": "^0.10.0",
+        "levn": "^0.4.1"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
+    "node_modules/@eslint/plugin-kit/node_modules/@eslint/core": {
+      "version": "0.10.0",
+      "resolved": "https://registry.npmjs.org/@eslint/core/-/core-0.10.0.tgz",
+      "integrity": "sha512-gFHJ+xBOo4G3WRlR1e/3G8A6/KZAH6zcE/hkLRCZTi/B9avAG365QhFA8uOGzTMqgTghpn7/fSnscW++dpMSAw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@types/json-schema": "^7.0.15"
+      },
+      "engines": {
+        "node": "^18.18.0 || ^20.9.0 || >=21.1.0"
+      }
+    },
     "node_modules/@fastify/busboy": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/@fastify/busboy/-/busboy-3.0.0.tgz",
@@ -946,6 +1184,72 @@
         "node": ">=6"
       }
     },
+    "node_modules/@humanfs/core": {
+      "version": "0.19.1",
+      "resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.1.tgz",
+      "integrity": "sha512-5DyQ4+1JEUzejeK1JGICcideyfUbGixgS9jNgex5nqkW+cY7WZhxBigmieN5Qnw9ZosSNVC9KQKyb+GUaGyKUA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18.18.0"
+      }
+    },
+    "node_modules/@humanfs/node": {
+      "version": "0.16.6",
+      "resolved": "https://registry.npmjs.org/@humanfs/node/-/node-0.16.6.tgz",
+      "integrity": "sha512-YuI2ZHQL78Q5HbhDiBA1X4LmYdXCKCMQIfw0pw7piHJwyREFebJUvrQN4cMssyES6x+vfUbx1CIpaQUKYdQZOw==",
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+      "license": "Apache-2.0",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/pure-rand": {
       "version": "6.1.0",
       "resolved": "https://registry.npmjs.org/pure-rand/-/pure-rand-6.1.0.tgz",
@@ -5680,7 +6491,6 @@
       "integrity": "sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "shebang-regex": "^3.0.0"
       },
@@ -5694,7 +6504,6 @@
       "integrity": "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=8"
       }
@@ -5896,7 +6705,6 @@
       "integrity": "sha512-6fPc+R4ihwqP6N/aIv2f1gMH8lOVtWQHoqC4yK6oSDVVocumAsfCqjkXnqiYMhmMwS/mEHLp7Vehlt3ql6lEig==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=8"
       },
@@ -5924,7 +6732,6 @@
       "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "has-flag": "^4.0.0"
       },
@@ -6106,6 +6913,19 @@
       "integrity": "sha512-gLXCKdN1/j47AiHiOkJN69hJmcbGTHI0ImLmbYLHykhgeN0jVGola9yVjFgzCUklsZQMW55o+dW7IXv3RCXDzA==",
       "license": "0BSD"
     },
+    "node_modules/type-check": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
+      "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "prelude-ls": "^1.2.1"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
     "node_modules/type-detect": {
       "version": "4.0.8",
       "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
@@ -6191,6 +7011,16 @@
         "browserslist": ">= 4.21.0"
       }
     },
+    "node_modules/uri-js": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
+      "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "dependencies": {
+        "punycode": "^2.1.0"
+      }
+    },
     "node_modules/util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -6301,7 +7131,6 @@
       "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
       "dev": true,
       "license": "ISC",
-      "peer": true,
       "dependencies": {
         "isexe": "^2.0.0"
       },
@@ -6312,6 +7141,16 @@
         "node": ">= 8"
       }
     },
+    "node_modules/word-wrap": {
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
+      "integrity": "sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/wrap-ansi": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
diff --git a/functions/package.json b/functions/package.json
index 9ba98d5..46163c2 100644
--- a/functions/package.json
+++ b/functions/package.json
@@ -18,7 +18,10 @@
     "firebase-functions": "^5.0.0"
   },
   "devDependencies": {
-    "firebase-functions-test": "^3.1.0"
+    "@eslint/js": "^9.0.0",
+    "eslint": "^9.20.1",
+    "firebase-functions-test": "^3.1.0",
+    "globals": "^15.0.0"
   },
   "private": true
 }
diff --git a/lib/_shared/widgets/chat_bubble_widget.dart b/lib/_shared/widgets/chat_bubble_widget.dart
index 1882ced..e151e91 100644
--- a/lib/_shared/widgets/chat_bubble_widget.dart
+++ b/lib/_shared/widgets/chat_bubble_widget.dart
@@ -1,6 +1,9 @@
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:image_network/image_network.dart';
 
+import '../../utils/global.dart';
+
 class ChatBubble extends StatelessWidget {
   final bool isMine;
   final String message;
@@ -69,34 +72,13 @@ class ChatBubble extends StatelessWidget {
                 .bodyMedium
                 ?.copyWith(color: Colors.white),
           ),
-          // english version (if there is)
-          if (translations.isNotEmpty)
-            ...translations.entries
-                .where(
-                  (element) => element.key != 'original',
-                )
-                .map(
-                  (e) => Text.rich(
-                    TextSpan(children: [
-                      TextSpan(
-                          text: '${e.key} ',
-                          style: Theme.of(context)
-                              .textTheme
-                              .bodySmall
-                              ?.copyWith(
-                                  fontWeight: FontWeight.bold,
-                                  color:
-                                      isMine ? Colors.black87 : Colors.grey)),
-                      TextSpan(
-                        text: e.value,
-                        style: Theme.of(context).textTheme.bodySmall?.copyWith(
-                            fontStyle: FontStyle.italic,
-                            color: isMine ? Colors.black87 : Colors.grey),
-                      )
-                    ]),
-                    textAlign: isMine ? TextAlign.right : TextAlign.left,
-                  ),
-                )
+          if (translations.isNotEmpty &&
+              translations.containsKey(Global.localLanguageCode) &&
+              translations[Global.localLanguageCode] != null)
+            if (kDebugMode)
+              buildTranslation(context: context, isMine: isMine)
+            else if (!isMine) //in production mode, only show translation for other users, not mine
+              buildTranslation(context: context, isMine: isMine)
         ],
       ),
     ));
@@ -110,6 +92,27 @@ class ChatBubble extends StatelessWidget {
       ),
     );
   }
+
+  Widget buildTranslation(
+      {required BuildContext context, required bool isMine}) {
+    return Text.rich(
+      TextSpan(children: [
+        TextSpan(
+            text: '${Global.localLanguageCode} ',
+            style: Theme.of(context).textTheme.bodySmall?.copyWith(
+                fontWeight: FontWeight.bold,
+                color: isMine ? Colors.black87 : Colors.grey)),
+        TextSpan(
+          text:
+              translations[Global.localLanguageCode] ?? 'translation not found',
+          style: Theme.of(context).textTheme.bodySmall?.copyWith(
+              fontStyle: FontStyle.italic,
+              color: isMine ? Colors.black87 : Colors.grey),
+        )
+      ]),
+      textAlign: isMine ? TextAlign.right : TextAlign.left,
+    );
+  }
 }
 
 class _DefaultPersonWidget extends StatelessWidget {
diff --git a/lib/main.dart b/lib/main.dart
index 4738fa9..7c781da 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -8,12 +8,14 @@ import 'package:public_chat/service_locator/service_locator.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 
+import 'utils/global.dart';
+
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
 
   await Firebase.initializeApp(options: DefaultFirebaseOptions.currentPlatform);
   ServiceLocator.instance.initialise();
-
+  Global().init();
   runApp(BlocProvider<GenaiBloc>(
     create: (context) => GenaiBloc(),
     child: const MainApp(),
diff --git a/lib/utils/global.dart b/lib/utils/global.dart
new file mode 100644
index 0000000..5e90f13
--- /dev/null
+++ b/lib/utils/global.dart
@@ -0,0 +1,39 @@
+import 'dart:io' as io;
+import 'package:flutter/foundation.dart' show kDebugMode, kIsWeb;
+import 'package:universal_html/html.dart';
+
+class Global {
+  Global._internal();
+  static final Global _instance = Global._internal();
+  factory Global() => _instance;
+  init() {
+    localLanguageCode = getLanguageCode();
+    if (kDebugMode) {
+      print('localLanguageCode: $localLanguageCode');
+    }
+  }
+
+  static String localLanguageCode = 'unknown';
+  String getLanguageCode() {
+    try {
+      if (kIsWeb) {
+        // Get language from web browser
+        final browserLocale = window.navigator.language;
+        // ignore: unnecessary_null_comparison
+        if (browserLocale == null) {
+          // fix Error: Method 'split' cannot be called on 'String?' because it is potentially null.
+          return 'unknown';
+        }
+        return browserLocale.split('-')[0].toLowerCase();
+      } else {
+        // Get language from mobile device
+        final deviceLocale =
+            io.Platform.localeName; // Use 'dart:io' for mobile devices
+        return deviceLocale.split('_')[0].toLowerCase();
+      }
+    } catch (e) {
+      // Return 'en' as default language if there's an error
+      return 'unknown';
+    }
+  }
+}
diff --git a/pubspec.yaml b/pubspec.yaml
index 75f5894..f6666fe 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -36,6 +36,7 @@ dependencies:
   # Gemini for GenAI chat
   google_generative_ai: ^0.4.3
   image_network: ^2.5.6
+  universal_html: ^2.2.4
 
 dev_dependencies:
   flutter_test: