It seems potentially useful to allow install profiles to be run, not only at site creation, but also at any point afterwards. That would make them useful for publishing "recipes" which would mostly involve the creation of site building items such as content types, views, and fields. However, they could also be used to install contrib modules, themes, and layouts where necessary.
This would allow users to use a install profile even after they have installed backdrop and otherwise started building their sites. And it would allow them to run more than one install profile, each of which would provide a different set of functionality.
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There is a Drupal 7 contrib module that "lets the administrator see all administration pages in her preferred language" and which could be ported to Backdrop: https://www.drupal.org/project/...
Allow admin to select admin language seperate from front end language (multilingual)
@stpaultim – You're right: my approach affects also the main menu. I guess, because menus are also considered as user interface (not as content). @findlabnet – If I didn't miss anything,...
Allow admin to select admin language seperate from front end language (multilingual)
Go to the account edit of the desired user. On the horizontal tab below "Region and Language," select "English" or another language. WFM.
Allow admin to select admin language seperate from front end language (multilingual)