"django-admin compilemessages" does not compile translations for every app automatically, documentation is misleading

[jggc]

The documentation at ​https://docs.djangoproject.com/en/1.8/topics/i18n/translation/ says

When you run makemessages from the root directory of your project, the extracted strings will be automatically distributed to the proper message files. That is, a string extracted from a file of an app containing a locale directory will go in a message file under that directory. A string extracted from a file of an app without any locale directory will either go in a message file under the directory listed first in LOCALE_PATHS or will generate an error if LOCALE_PATHS is empty.

And a bit further it says :

This tool runs over all available .po files and creates .mo files, which are binary files optimized for use by gettext. In the same directory from which you ran django-admin makemessages, run django-admin compilemessages like this:

This is misleading since django-admin compilemessages has to be ran in every application's directory.

[Claude Paroz]

Duplicate of #24159