add tests for context extraction about puente HOT 4 CLOSED

@robhudson Want to look into this? The relevant pieces are here:

https://github.com/willkg/puente/blob/master/puente/management/commands/extract.py#L54

and the add_context/split_context functions are here in Tower:

https://github.com/clouserw/tower/blob/master/tower/__init__.py#L59

There's some docs on msgctxt in the gnu manual:

https://www.gnu.org/software/gettext/manual/html_node/Contexts.html

What we want to know is if we're using pgettext from Django, whether those strings get extracted into the .pot file with context. If not, then we have to figure out why. It's possible that pgettext and friends aren't in the KEYWORDS list or something like that.

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There's a bug in how we do KEYWORDS where we're not getting the magic incantations from Babel on how the keywords get parsed. Totally my fault.

Anyhow, fixing that allows pgettext to work fine in Python files.

Jinja2 trans blocks don't support context currently, so we don't have to worry about them. I don't know about Jinja2 gettext tags, though. The docs don't talk about context at all. I think we'd have to look at the code.

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Pretty sure I fixed what's fixable in d87ee58.

The only outstanding thing is how you do context stuff with Jinja2 gettext. Is it possible? Do we need to fix it in Puente and and submit a fix upstream?

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I'm going to close this out and create a new issue for supporting context in Jinja2 templates.

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