Refactor SMS and Coupon resources to utilize localization for labels and messages, enhancing internationalization support. Update .env.example to change APP_LOCALE to 'tk'.

lang/tk/auth.php

@@ -0,0 +1,9 @@
+<?php
+
+return [
+
+    'failed' => 'Bu maglumatlar biziň ýazgylarymyza gabat gelenok.',
+    'password' => 'Berlen parol nädogry.',
+    'throttle' => 'Giriş synanyşyklary köp. :seconds sekuntdan soň gaýtadan synanyşyň.',
+
+];