Philippe Verdy wrote:

This clearly does not work : I just hear a "beep" when I press it in the
Translation editor, with my French AZERTY keyboard on Chrome for Windows.
The shortcut is possibly not mapped (or the update still not deployed on
Meta).

Yes, the patch doesn't appear to have been deployed onto Wikimedia wikis yet, but it works quite well on a developer version of Translatewiki — take <http://dev.translatewiki.net/w/i.php?title=Special:Translate&group=core&filter=!translated&action=translate&language=jbo> as an example and try pressing Alt+1, Alt+2, etc. on various messages.

As far as shortcut conflicts are considered, I believe that's the reason behind the removal of Shift+Alt+1, etc. as requested on Translatewiki — but you'll have to talk to Niklas (who's also CC'd) to this list about that.

          Tomasz