The months in Thunderbird are showing up in a non-English language.
Happened acutely about a week ago. Not in relation to an update; updated today and didn't fix it. Screen cap below. Default language is English, spell checking is English, it seems that just the dates are not? Screen cap below.
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Never mind, fixed my own problem. It was actually a bizarre language issue in the date and time section of Windows. Voruba? Never heard of it, but it's fixed.