Rework translation tests

Rework test-languages so that we can test *all* languages as well
if needed and use the same script for both buildlang and testlang.
Add new tox job "publishlang" to publish all languages at once.

Change-Id: I7c7a5622df219f8ffa2dd1b824179de749ea2fed
Imported Translations from Transifex

Change-Id: I7ec8faec14b6ff7e96232d2eedd6a55a2fe39a16
Merge "Rework translation tests"