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Now that #29941 (moved) is basically fixed on the server-side we are getting all the new goodness with the next translations fetch. We should clean-up the locales we ship while doing so (removing the ones we don't support anymore etc.). Additionally, we should adapt all the scripts around translation update imports if that's needed. And, after checking everything is still working we need to backport the changes to a stable branch (as the locale updates that landed in 9.5a3 will ride the train).