i18n(validation): publish Laravel lang files + translate to RO and RU

- `php artisan lang:publish` created lang/en/{auth,pagination,passwords,validation}.php
- Copied to lang/ro/ and lang/ru/ and translated 30+ most-used validation
  rules (required, email, min, max, unique, exists, etc.), auth messages
  (failed, password, throttle), and pagination labels (previous/next).
- Fixes 'validation.required' literal appearing on form errors in RO/RU
  locales.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

lang/ru/passwords.php

@@ -0,0 +1,22 @@
+<?php
+
+return [
+
+    /*
+    |--------------------------------------------------------------------------
+    | Password Reset Language Lines
+    |--------------------------------------------------------------------------
+    |
+    | The following language lines are the default lines which match reasons
+    | that are given by the password broker for a password update attempt
+    | outcome such as failure due to an invalid password / reset token.
+    |
+    */
+
+    'reset' => 'Your password has been reset.',
+    'sent' => 'We have emailed your password reset link.',
+    'throttled' => 'Please wait before retrying.',
+    'token' => 'This password reset token is invalid.',
+    'user' => "We can't find a user with that email address.",
+
+];