TF-2644 Display warning dialog when pick file exceeded maximum size in composer

lib/main/localizations/app_localizations.dart

@@ -3916,4 +3916,18 @@ class AppLocalizations {
       name: 'zoomOut',
     );
   }
+
+  String get messageWarningDialogWhenExceedMaximumFileSizeComposer {
+    return Intl.message(
+      'Your message is larger than the size generally accepted by third party email systems. If you confirm sending this mail, there is a risk that it gets rejected by your recipient system.',
+      name: 'messageWarningDialogWhenExceedMaximumFileSizeComposer',
+    );
+  }
+
+  String get continueAction {
+    return Intl.message(
+      'Continue',
+      name: 'continueAction',
+    );
+  }
 }