Django i18n layer is on top of gettext and provide may crucial features such as per-request locales, lazy translations etc.
- PEP8 fixes. - Don't need to disable .socket and .service. Disabling .service will take care of disabling both. - Update the introduction message. - Add prefix to form so that it can potentially be mixed with other forms.
Resolves issue https://github.com/freedombox/Plinth/issues/231 "Option to disable avahi-daemon"