Admin pages are in English Drupal?

All Admin pages are in English and admin menu always in LTR?

1) First go to Administration -> Configuration -> Regional and language -> Languages -> Detection and selection tab and make sure to have “Account administration pages“ enabled.

2) Then go to People and edit your user. Admin -> Edit Profile -> Edit

Go down to the Language settings section. You should now see a Administration pages language dropdown. 

Select and save.

3) Go to the administration language using the following settings:

url: /admin/config/regional/language/detection

"Account administration pages" - Enabled

"Follow the user's language preference." - Enable

and drag and drop to the top position.

4) Clear the Drupal caches.