Pontoon: Update Slovenian (sl) localization of Thimble
Pontoon: Update Slovenian (sl) localization of Thimble

Localization authors:
- Rok Žerdin <rok.zerdin1990@gmail.com>

mozilla/thimble.mozilla.org,humphd/thimble.mozilla.org,humphd/thimble.mozilla.org,mozilla/thimble.mozilla.org,humphd/thimble.mozilla.org,mozilla/thimble.mozilla.org,humphd/thimble.mozilla.org,mozilla/thimble.mozilla.org