updatemessages doesn't download all the translations

[int-y1]

updatemessages downloads some translations, but not all translations. This problem is blocking #2142.

Here's a successful download:

Building ZIP archive with the latest translations for 'fr'/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\� - OK
|�/�-�\�|�Extracting: '/locale/fr/LC_MESSAGES/django.po'
Extracting: '/locale/fr/LC_MESSAGES/djangojs.po'
Warning: Downloaded translations do not match current project configuration. The following files will be omitted:
 - '/locale/fr/LC_MESSAGES/dmoj-user.po'

Here's a failed download:

Building ZIP archive with the latest translations for 'kk'|�/�-�\�|�/�-�\�|�/�-� - skipped
Warning: Export was skipped. Please note that this method can be invoked only once per 30 minutes.
\�|�/�-�\�|�/�-�\�|�/�-�\�|�Extracting: '/locale/kk/LC_MESSAGES/django.po'
Extracting: '/locale/kk/LC_MESSAGES/djangojs.po'
Warning: Downloaded translations do not match current project configuration. The following files will be omitted:
 - '/locale/kk/LC_MESSAGES/dmoj-user.po'

[int-y1]

#2315 probably fixed this.