Fix language urls
Translated using Weblate (Dutch)

Currently translated at 92.1% (718 of 780)
Merge remote-tracking branch 'origin/master'
Move models and managers to submodules

This way code is better structured and related code is sitting in single
module.
Translated using Weblate (Swedish)

Currently translated at 51.3% (400 of 780)
Merge remote-tracking branch 'origin/master'
Wrap long line
Split huge test classes by tested element
Remove not needed import
Simplify code for checking ACL filtered objects
Single place to define site URL
Increase limit for number of parents
Single place to define sleep waiting for git lock
Not needed newlines
Add missing imports
Disable warnings for both classes
Okay, this seems to be the right place for overrides
Simplify selector
Use generic way for styling
Use single selector