Environment option to skip compilation of translation files

[ben-beauhurst]

Added environment option LINKCHECK_SKIP_TRANSLATIONS to skip compilation of translation files when they are not needed.

[claudep]

I'm not convinced about this. During a pip install, most of the time the wheel will be installed from PyPi without a need for rebuilding, won't it?

[claudep]

The typo commit could be pushed in a separate PR.

[ben-beauhurst]

I'm not convinced about this. During a pip install, most of the time the wheel will be installed from PyPi without a need for rebuilding, won't it?

We were still running into this issue:
#200
where it tries to call the compilemessages management command but can't find django-admin. Since it's apparently a recurring problem, thought it would be handy to give users the option to skip translations when not needed.