SRT format is widespread and is synonymous with translation.
Support for the video subtitle format SubRip Text in Zanata would be cool.
Okapi supports it via RegexFilter (and provides the _tested_ regex).
After gh reviews, have updated it to include SubView and WebVTT (essentially the same formatting).
Note: with this change, the file project type supports the following extensions:
VERIFIED with Zanata 3.5.0-SNAPSHOT (git-server-3.4.1-77-gc84b8dd)