more system addons - commit fix (#1845)
more system addons - commit fix (#1845)

* more system addons - commit fix

Added more system addons and the new default dark & light themes...
Accidentally committed without creating a pull request yesterday, creating a pull request now.

* removed spaces

had space characters at the end of 2 lines...

kumar303/addons-frontend,tsl143/addons-frontend,tsl143/addons-frontend,aviarypl/mozilla-l10n-addons-frontend,mozilla/addons-frontend,aviarypl/mozilla-l10n-addons-frontend,mozilla/addons-frontend,mozilla/addons-frontend,mozilla/addons-frontend,kumar303/addons-frontend,kumar303/addons-frontend,kumar303/addons-frontend,tsl143/addons-frontend,aviarypl/mozilla-l10n-addons-frontend,tsl143/addons-frontend,aviarypl/mozilla-l10n-addons-frontend