Leave group calls when leaving a group
Refactor audio out of code, better resource management

Fixes #739 and fixes #777
Fix #778
Fix #635
Extra tooltip and word from the un-picked commit
Cherry pick f3019a8111f25ef0400c287d851b992d4ca3d839
Add missing license headers
Fix logic error in audio subscription code
There was wrong english string
Translation of synchronous writing to DB settings
Translated call control buttons
Slightly improoved translation
Merge branch 'pr785'
Italian translation: update
Merge branch 'pr788'
Update makedist.sh
Create postinstall
Create preinstall
Merge branch 'pr789'
fix #775