IntComma without RequestContext

I am feeling a little lost, a project that I have used intcomma in reliably on an update suddenly stopped getting the commas inserted. This is for an out of request cycle email.

Attempting activate the language doesn't seem to change anything. Am I missing something simple here?

>>> from django.contrib.humanize.templatetags.humanize import intcomma

>>> intcomma(1000)

u'1000'

>>> intcomma("1000", use_l10n=False) #not sure how to do this in templates

u'1,000'

>>> from django.utils.translation import activate, get_language

>>> get_language()

u'us-en'

>>> activate("us-en")

>>> intcomma("1000")

u'1000'

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