locale: update translations sources

[xrmx]

WARNING: not sure this is right as maybe i need a tx pull to get the updates po and merge them later.

So that people can translate the actual strings :)

This has been created with django-admin makemessages --all

[ericholscher]

The i18n workflow is mostly here: https://github.com/rtfd/readthedocs.org/blob/master/fabfile.py#L9-L25

That said, it hasn't been maintained or updated in a while. I'd really like to get someone to take ownership of the translation of RTD itself, so if this is of interest, it would definitely be somewhere we need more knowledge around.

[xrmx]

Seen that, installed tx but that instructions does not make much sense to me:

• tx pull does nothing as it skips all the files:
  tx INFO: Skipping 'fr' translation (file: readthedocs/locale/fr/LC_MESSAGES/django.po).
  same with tx pull -s, git status after that is nothing changed
  If someone has more clue any help appreciated

[xrmx]

It looks like something around --disable-overwrite got reversed and by default it does not overwrite anymore.
Reported here transifex/transifex-client#233

[xrmx]

I think i figured out the workfow a bit, will open a few PR:

• one updating the english lang translation, aka source language locale: update and build the english translation #4187
• one updating the italian one, as that's what we are interested in :) Update italian locale #4188
• one updating the fabfile with something sensible fabfile: update i18n helpers #4189

Closing this one

[xrmx]

@ericholscher having a smoother translation workflow will help our team quite a bit (and frankly we are quite in an hurry to have a complete italian translation :), so we'll gladly help.