CC-4841: Silan script

- temp commit
Upgrade script missing cc_stream_setting->off_air_meta and cc_pref->enable_replay_gain
Added locales and default locale settings to upgrade script
CC-4860: Library -> Context Menu -> Can't download files

-fixed
CC-4861: airtime-check-system AIRTIME_STATUS_URL isn't formatted properly

-fixed
Changed path to locale directory from absolute to relative
Save button on edit user settings was not translating
Small change to Russian po file
Smart block tooltip content breaks when language setting is not english
CC-4857: Playlist length will increase every time I duplicate it.

- fixed
CC-4734: French - UI breaks in several places

-fixed
Updating German po file
CC-4841: Silan script

done
Merge branch 'silan-script' into devel
replay gain does not work sometimes
added silan changes to upgrade script
Merge branch 'devel' into 2.3.x-saas