https://bugs.winehq.org/show_bug.cgi?id=31784
--- Comment #5 from François Gouget fgouget@codeweavers.com --- Currently we have two VMs that we can configure for additional locales: wvistau64 and w7u (w1064 might be a third one but it's the only Windows 10 VM). One was configured for Arabic, a right-to-left language, and the other for Japanese, a double-byte language.
It turns out that Hebrew and Korean had failures not seen in these two locales. Switching these two VMs to Hebrew and Korean would help fix the known issues. But then bugs could creep in the no longer tested locales
Since we have only two VMs we are currently limited to only testing two non-English locales. Adding support for snapshots would solve this issue: we could configure these two VMs with as many locales as we wish.