compose: Add translations for ContentValidationError enum

Author: sirpengi

assets/l10n/app_en.arb

@@ -75,6 +75,22 @@
   "@successMessageCopied": {
     "description": "Message when content of a message was copied to the users system clipboard."
   },
+  "contentValidationErrorTooLong": "Message length shouldn't be greater than 10000 characters.",
+  "@contentValidationErrorTooLong": {
+    "description": "Content validation error message when the message is too long."
+  },
+  "contentValidationErrorEmpty": "You have nothing to send!",
+  "@contentValidationErrorEmpty": {
+    "description": "Content validation error message when the message is empty."
+  },
+  "contentValidationErrorQuoteAndReplyInProgress": "Please wait for the quotation to complete.",
+  "@contentValidationErrorQuoteAndReplyInProgress": {
+    "description": "Content validation error message when a quotation has not completed yet."
+  },
+  "contentValidationErrorUploadInProgress": "Please wait for the upload to complete.",
+  "@contentValidationErrorUploadInProgress": {
+    "description": "Content validation error message when attachments have not finished uploading."
+  },
   "dialogCancel": "Cancel",
   "@dialogCancel": {
     "description": "Button label in dialogs to cancel."

lib/widgets/compose_box.dart

@@ -90,16 +90,16 @@ enum ContentValidationError {
   quoteAndReplyInProgress,
   uploadInProgress;
 
-  String message() {
+  String message(ZulipLocalizations zulipLocalizations) {
     switch (this) {
       case ContentValidationError.tooLong:
-        return "Message length shouldn't be greater than 10000 characters.";
+        return zulipLocalizations.contentValidationErrorTooLong;
       case ContentValidationError.empty:
-        return 'You have nothing to send!';
+        return zulipLocalizations.contentValidationErrorEmpty;
       case ContentValidationError.quoteAndReplyInProgress:
-        return 'Please wait for the quotation to complete.';
+        return zulipLocalizations.contentValidationErrorQuoteAndReplyInProgress;
       case ContentValidationError.uploadInProgress:
-        return 'Please wait for the upload to complete.';
+        return zulipLocalizations.contentValidationErrorUploadInProgress;
     }
   }
 }
@@ -704,7 +704,7 @@ class _SendButtonState extends State<_SendButton> {
         for (final error in widget.topicController?.validationErrors ?? const [])
           error.message(zulipLocalizations),
         for (final error in widget.contentController.validationErrors)
-          error.message(),
+          error.message(zulipLocalizations),
       ];
       showErrorDialog(
         context: context,