BUGFIX: Correct markup syntax in locale files

As [reported on meta](https://meta.discourse.org/t/moderation-bug-redirection-to-faq/16380), the flag modal had unexpected behaviour when clicking on links.

Turns out that in French and Portuguese locale files the anchor tag syntax was invalid `</ a>` instead of `</a>` which breaks the markup.

I submitted the corrected translations to Transifex, pulled the translations via Transifex client, and verified it's working locally.

Confirmed test suite is passing. cc @nlalonde