merge from master

apps/files/admin.php

apps/files/ajax/autocomplete.php

apps/files/ajax/move.php

apps/files/ajax/upload.php

apps/files/appinfo/filesync.php

apps/files/appinfo/remote.php

apps/files/appinfo/update.php

apps/files/download.php

apps/files/index.php

apps/files/l10n/ar.php

apps/files/l10n/bg_BG.php

apps/files/l10n/ca.php

apps/files/l10n/cs_CZ.php

apps/files/l10n/da.php

apps/files/l10n/de.php

apps/files/l10n/de_DE.php

apps/files/l10n/el.php

apps/files/l10n/eo.php

apps/files/l10n/es.php

apps/files/l10n/es_AR.php