Use month abbreviations instead of numbers for freq chart in east Asian languages

[kueda]

A user requested this change on Crowdin:

@amanda and/or @angie can confirm, but I think this would change it from looking like "1 2 3"…" to "Month 1, Month 2, Month 3". Looks like we're use date-fns and the MMMMM format here, so maybe this is as simple as changing that to LLLLL, but if not, this might have to be put under translator control.