I’m seeing the same bug in v2.0.0.beta5 +6
I’m not able to fix it or find a workaround. I’m seeing this for all customized text. “Revert” always turns it into a translation-missing message. So, I’m finding no simple way to revert to default text (since reversion isn’t working, I’m not even clear whether it’s supposed to return to default text versus to the previously-saved edition).