Merge pull request #5116 from owncloud/interfaces2

lib/apphelper.php

lib/l10n/factory.php

lib/private/appframework/http/request.php

lib/private/config.php

lib/private/helper.php

lib/private/l10n.php

lib/private/server.php

lib/private/util.php

lib/public/ihelper.php

lib/public/il10n.php

lib/public/irequest.php

lib/public/iservercontainer.php

lib/public/iurlgenerator.php

lib/urlgenerator.php