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:
"Account administration pages" - Enabled
"Follow the user's language preference." - Enable
and drag and drop to the top position.