Update subject to verify mail address

VT-1638

theme/email/messages/messages_en.properties

@@ -1,4 +1,4 @@
-emailVerificationSubject=Verify email
+emailVerificationSubject=Verify your E-Mail Address for your {2}
 emailVerificationBody=Hi!\n\nThanks for creating a new {2}. To start using it, please confirm your email address:\n\n{0}\n\nWelcome!\n\nThe VSHN Team \n\nPS: Did you receive this e-mail without signing up? In that case, you can ignore this message.\n\nPPS: This link will expire within {3}.
 emailVerificationBodyHtml=<p>Hi!</p><p>Thanks for creating a new {2}. To start using it, please confirm your email address:</p><p><a href="{0}">Link to e-mail address verification</a></p><p>PS: Did you receive this e-mail without signing up? In that case, you can ignore this message.</p><p>PPS: This link will expire within {3}.</p>
 emailTestSubject=[KEYCLOAK] - SMTP test message