The daily "Imported Translations from Transifex" patch includes all po
files, even the ones that are completely untranslated or only have a partial
translation. There's no real need for these files.
Therefore, only download files that are at least 75 per cent translated.
There is one exception: For openstack-manuals the common directory
contains many files where only a few need to be translated - so allow
here 8 per cent translation. This currently downloads the Japanese and
French files and thus covers the languages that we need.
Partial-Bug: #1317794
Change-Id: I763c21768e3876aaaf4734bf2d769de20b49ff42
017c4505b4
