Remove .mo files from the Django Git repository

[claudep]

Binary/generated files are no good candidates to be included in a Git repository. They unnecessarily bloat the repository without added value.
It would be nice to compile those .mo files at package build time.

[aaugustin]

That change would make it a bit more error-prone to work on i18n'd projects with the development version of Django.

I'm not saying we can't remove the .mo files, but we need to think about the consequences. They add some value.

[claudep]

I think it would be possible to check the presence of .mo files in runserver and output an appropriate warning. I understand the commodity of having .mo files in the repo, but I don't think this justifies having generated binary files in a VCS.

[claudep]

Here's a branch where I started working on this: ​https://github.com/claudep/django/tree/23321

[claudep]

​https://github.com/django/django/pull/3392

[timgraham]

Code looks fine to me, but would be good to get an opinion from another person familiar with translations too.

[jezdez]

I don't think we should go that route as it would introduce a couple of issues that make it harder for our users and from a maintenance standpoint:

• The most pressing issues IMO will show up for users that are using not-yet-released versions of Django, e.g. translators and contributors.
  • there are differences in gettext versions that we would not be able to fix
  • Windows users don't usually have gettext installed
• The test system would have to compile the po files on every test run to make sure to have a consistent set to base tests on
• Users on system with a non-writable file system may have problems with the subprocess call as part of trans_real.py
• The Django release manager would have to have gettext installed and run an additional command to build the tarball, something that I think is better suited for the translation manager (who has to pull files from Transifex anyways)

I understand that having compiled files in a VCS aren't good, but the proposed plan doesn't convince me to drop the mo files.

If only we'd use Babel instead.. it does have the ability to compile po files to mo files without dependency on gettext.