* Create main-sc.json

* Create languages-sc.json

* Update languages.json

* Update main-sc.json

(just a couple of minor edits to the translation)

Icelandic, Sardinian, Bulgarian, Czech, Catalan, Turkish.

Translate-URL: https://hosted.weblate.org/projects/jitsi/main/

Co-authored-by: Sveinn í Felli <sv1@fellsnet.is>
Co-authored-by: Václav Zbránek <vaclav@weblate.org>
Co-authored-by: Damian Minkov <damencho@jitsi.org>
Co-authored-by: Joan Montané <joan@montane.cat>
Co-authored-by: Oğuz Ersen <oguzersen@protonmail.com>
Co-authored-by: Rafael Fontenelle <rafaelff@gnome.org>
Co-authored-by: Adrià Martín <adriamartinmor@gmail.com>
Co-authored-by: Tomas Apeltauer <tomas.apeltauer@gmail.com>