Removed English-US language option
CC-4797: Generate localization locales on install

-added check on Debian before writing to /etc/locale.gen
Merge branch 'devel' of dev.sourcefabric.org:airtime into devel
CC-4850: Upgrade Scripts -> Add default timezone and locale for each user in cc_pref

-fallback to default settings if user setting is not set
CC-4848: Streaming server passwords should be hidden with dots, once entered

-fixed
CC-4855: System->Preferences->Fade in/out settings: Number's format is incorrect.

-fixed
Update Chinese translation
Merge branch 'devel' of dev.sourcefabric.org:airtime into devel
CC-4847: Listener Stats page shows misleading error when the Icecast admin password has not been entered

- done
Merge branch 'devel' of dev.sourcefabric.org:airtime into devel
Merge branch 'devel' into 2.3.x-saas