Work around Firefox bug with 'gregory' calendar era names
#2033
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Works around https://bugzilla.mozilla.org/show_bug.cgi?id=1752253 by allowing either
'a'or'ad'for the CE era and'b'or'bc'for the BCE era.This bug only occurs with Firefox and our tests don't use FF, so there wasn't any way to add a test for it. But I did verify it on the docs playground and it works great in FF 97.
Fixes #2020.