This module lets the administrator see all administration pages in her preferred language. You can use this to display the frontend of the site in one language and still keep most of the backend in English (or another language of your choice). You can use the standard Languages page to choose the language of the admin pages.
# Project URL
# Where is the code?
# Estimated completion date
# Who's doing the port?
# What help do they need?
# D8 roadmap
This is included in Drupal Core now.
You need to enable the following language detection: "Account administration pages".
And you also need to have at least two languages enabled before you can see the "Administration pages language" dropdown.
# Background and reference information