chore(mobile): translate toast messages (#17964)

mobile/lib/utils/translation.dart

@@ -0,0 +1,14 @@
+import 'package:easy_localization/easy_localization.dart';
+import 'package:intl/message_format.dart';
+
+String t(String key, [Map<String, Object>? args]) {
+  try {
+    String message = key.tr();
+    if (args != null) {
+      return MessageFormat(message).format(args);
+    }
+    return message;
+  } catch (e) {
+    return key;
+  }
+}