non-en-US Tor Browser 9.5a6 won't start up
A user on the #tor IRC channel experienced an error after their browser updated (presumably to 9.5a6). The error is in Turkish, but it appears to be a undefined entity error in browser.xul that is related to the #19757 (moved) patches.
I confirmed that a browser window fails to open (and the browser exits) when I use clean installs of both es-ES and tr packages on macOS.
My best guess is that translations were not updated in Torbutton prior to this Tor Browser release, but I have not confirmed that yet.