Currently, anytime a module adds a new configuration default, the module maintainer needs to write a hook_update_N() to merge the new default into the active set. This violates DRY by putting the default in two different places, and should not be necessary for all the same reasons hook_install() doesn't need to call schema_install().
Backdrop's update process can detect changes to the default sets and apply the changes automatically.
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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)