Because the Transifex API is hilariously bad at namespacing, this will
work for uploading to any project with its "slug" set to `zulip-test`
that you have access to; for me, this is a fresh test project I
created in my own personal Transifex organization.
To use, just follow the command in `tools/push-translations`, but
s/zulip/zulip-test/g.
This commit also adds a tool to push translation sources to Transifex.
This tool makes sure that we don't push mobile source file. Mobile
source file is supposed to be handled from Zulip-Mobile repo.
This reverts commit ba8dc62132.
As best I can tell, the old configuration was correct for what Django
wanted. Further testing is required, but this at least brings
.tx/config to match the actual filenames; I think our Chinese
translations have been broken until now.