Fix translating after WTForms 3 removed form._get_translations #2473
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From #2467
Meta.get_translations is available in WTForms 2
https://wtforms.readthedocs.io/en/3.1.x/changes/#version-2-0
Upstream docs:
https://wtforms.readthedocs.io/en/3.1.x/i18n/#writing-your-own-translations-provider
I see they instantiate a new MyTranslations every time Meta.get_translations() is called though???