i18n(nav): actually add Protocoale forsunki to RU + EN nav.php

Prior commit only landed the RO entry; the RU + EN Edits were silently
skipped (file-not-read guard). Now all 3 langs have the label.

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

lang/en/nav.php

@@ -55,6 +55,7 @@ return [
         'Plăți' => 'Payments',
         'Posturi de lucru' => 'Work bays',
         'Procentaj' => 'Commission',
+        'Protocoale forsunki' => 'Injector protocols',
         'Rapoarte' => 'Reports',
         'Recomandări' => 'Recommendations',
         'Roluri & Drepturi' => 'Roles & permissions',