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

Localization authors:
- Rok Žerdin <rok.zerdin1990@gmail.com>
- Matjaž Horvat <matjaz.horvat@gmail.com>

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,mozilla/thimble.mozilla.org