I am as baffled as you by the approval process in the ARTE team: all I can tell you is that when I did the Italian subtitles for Crimea: Russia's Shadow - ARTE (the video for which you first completed Greek subtitles), it also took over 3 weeks for them to be approved, But I don't know by whom, as none of the Italian-translating team members has rank to review them, let alone approve them; we are all just "contributors". And the same seems to obtain for Greek-translating members.
Hello there. I've already subtitled and submitted three videos as you saw in the topic title to the ARTE team. When exactly they're going to be approved?