Add a `date` template filter
Add a `date` template filter

This template filter uses `flask_babel`s builtin format_date.

MarauderXtreme/sipa,agdsn/sipa,agdsn/sipa,MarauderXtreme/sipa,lukasjuhrich/sipa,agdsn/sipa,lukasjuhrich/sipa,lukasjuhrich/sipa,lukasjuhrich/sipa,MarauderXtreme/sipa,agdsn/sipa