feat: add i18n support for Vietnamese and English

app/Services/TransferService.php

@@ -10,9 +10,6 @@ use Illuminate\Validation\ValidationException;
 
 class TransferService
 {
-    /**
-     * Transfer a feedback to another department.
-     */
     public function transfer(
         Feedback $feedback,
         Department $toDepartment,
@@ -22,7 +19,7 @@ class TransferService
     ): TicketTransferLog {
         if (empty(trim($reason))) {
             throw ValidationException::withMessages([
-                'reason' => __('Vui lòng nhập lý do chuyển tiếp.'),
+                'reason' => __('feedback.transfer_reason_required'),
             ]);
         }