CiviCRM translations on staging server not working
If you are still busy with this you can better download the latest version of the translation from the download-page CiviCRM: the localization files. The directory sql is only used for new installments, so the l10n-part will do.
You can switch the language first to English to force the system to re-translate the menu and set then the language back.
I have a working extension (standalone) to update the translation using the sql-file for single language systems, you can then use the latest translations for upgraded CiviCRM installments because great parts of CiviCRM are only translated during the installation and the translation in Transifex is always behind the new versions of CiviCRM. Let me know if you want to try my extension on your development system.