update issue and PR templates to clarify guidelines and language preference

Author: EAimTY

.github/ISSUE_TEMPLATE/general.md

@@ -6,5 +6,10 @@ about: Use this template for general issues
 <!--
 Thank you for contributing to the TUIC project!
 
-Before submitting your issue, please review the [Code of Conduct](https://github.com/tuic-protocol/tuic/blob/master/CODE_OF_CONDUCT.md) and [Contributing Guidelines](https://github.com/tuic-protocol/tuic/blob/master/CONTRIBUTING.md)
+Before submitting your issue, please review:
+
+- Code of Conduct: https://github.com/tuic-protocol/tuic/blob/master/CODE_OF_CONDUCT.md
+- Contributing Guidelines: https://github.com/tuic-protocol/tuic/blob/master/CONTRIBUTING.md
+
+English is the preferred language for communicating in this repository.
 -->

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,5 +1,10 @@
 <!--
 Thank you for contributing to the TUIC project!
 
-Before submitting your pull request, please review the [Code of Conduct](https://github.com/tuic-protocol/tuic/blob/master/CODE_OF_CONDUCT.md) and [Contributing Guidelines](https://github.com/tuic-protocol/tuic/blob/master/CONTRIBUTING.md)
+Before submitting your Pull Request, please review:
+
+- Code of Conduct: https://github.com/tuic-protocol/tuic/blob/master/CODE_OF_CONDUCT.md
+- Contributing Guidelines: https://github.com/tuic-protocol/tuic/blob/master/CONTRIBUTING.md
+
+English is the preferred language for communicating in this repository.
 -->