Drupal 7 Internationalization - why are my admin menus still in English?
If you swap from french to English the admin menu should also switch from french to English (Drupal 7).

In the tag "detection and selection" of Admin/Configuration/Regional and language/Languages" click the "Default" checkbox in order to use the default site language.

The "Localization update" module also helps you keep your interface translations for core and contributed modules up-to-date :


Enable the Locale (core) module
Download and enable the "Localization update" module
Go to the configuration page at admin/config/regional and language/translate interface/update
Wait as the module looks for translation updates
Click Refresh information button at the bottom of the page
Wait as the module gets all translations
Disable the Localization update module when finished to improve site performance.