A discussion on the inconsistency in plural definition in various languages led to the discovery of a problem affecting multiple languages, not just Hungarian. Moin started investigating after finding an issue in Hebrew and found more cases in other languages.
To address the issue, david made a change to limit the impact of failed compilations to _MF strings. Later, flink91 merged a patch that relaxes the MessageFormat compiler, allowing invalid plural keys in messages. Two more patches were merged: one to prevent creating invalid MF overrides in the admin UI and another to update pluralization rules in Ruby to match those in JavaScript.
I think Hungarian is not the only language affected by this. After checking Hebrew because of thisContribute > Bug mentioning problems, I thought maybe even more languages are affected, so I started looking for more cases.
After finding another one, I expect that even more languages are affected.
I’ve made this change to stop the bleeding. This will limit the impact of failed compilations so that they only affect _MF strings, rather than taking down the whole site.
We’ll keep digging into the root cause, and update here when we have a solution.