There is one major flaw that I mentioned earlier and I have to mention it again: PO files are not updated for a long time == new strings cannot be translated. As a first step it is necessary to update PO files for all languages​​. Unfortunately, now I focus my attention to bugs listed in bug 2014, so I do not have enough time to prepare scripts for updating PO files.
You are right Slavek, that will probably go after v14.0.0 is released unless someone want to volunteer on updating the "source" .po files. But at least for now users can review the existing .po and update translations were required.
Michele