Update translations (autogenerated message)

Update translations (autogenerated message)

Please note that this is a squshed commit and the work of:
Symbolist, macdiesel, nedbat, doctoryes, muzaffaryousaf and muhammad-ammar

This version was from 2012.

This is a squash of 38 commits ending with
5b080f979d692804452400ac5bed9b17c50b001e

There's a move afoot to put assets inside individual Django apps,
instead of in upper-level "templates" directories.  These i18n
configuration files have to take this into account.

.underscore files are easy to find by their unique file extension, so
the rule can be simple.  Mako files are .html, so we have to be more
nuanced about it.  We don't want to get pure HTML files, and we don't
want to get .html files for tests, even if they are Mako templates.

Also, remove the one use of _() in a test feature, since there's no
point.