i18n(subcontract-jobs + filament core): +6 keys + fix missing 'no options' RU/EN

- +6 subcontract-jobs translations (Lucrare, Termene, Returnat, ETA,
  helper 'Setat manual dacă markup = 0.', empty-state description)
- Add lang/vendor/filament-forms/{ru,en}/components.php with select
  no_options_message + max_items_message. Filament ships RO copy with
  no RU override, so 'Nu sunt disponibile opțiuni.' bled through into
  RU/EN locales.

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

lang/vendor/filament-forms/en/components.php

@@ -0,0 +1,11 @@
+<?php
+
+return [
+    'select' => [
+        'no_options_message' => 'No options available.',
+        'max_items_message' => 'Only :count items may be selected.',
+    ],
+    'mentions' => [
+        'no_options_message' => 'No options available.',
+    ],
+];