Better way to convert things to utf-8 (#951)

I think this should fix all the unicode errors.
Handle subtitles without timings in billing reports (#951)
Handle no subtitle/translate task during billing reports (#951)
Fixed syntax error
Better way to conver unicode values.

The old code was trying to change tuples, which failed.
Merge pull request #956 from pculture/gh-951

Gh 951
Merge branch 'staging' into gh-952

Conflicts:
	apps/teams/models.py