Add support for utf-8 OS X strings

This needs https://github.com/translate/translate/pull/132 to work.

Fixes #491

Signed-off-by: Michal Čihař <michal@cihar.com>
Translated using Weblate (Turkish)

Currently translated at 100.0% (1002 of 1002)
Merge remote-tracking branch 'origin/master'
Register file formats using decorator

Signed-off-by: Michal Čihař <michal@cihar.com>
Sort supported file formats

Signed-off-by: Michal Čihař <michal@cihar.com>
Early validate file format

Signed-off-by: Michal Čihař <michal@cihar.com>
Check for file format support when starting Weblate

This way we offer only valid choices in the interface.

See also issue #491

Signed-off-by: Michal Čihař <michal@cihar.com>
Merge branch 'master' into bootstrap