merge master into filecache_mtime

apps/files/css/files.css

apps/files/js/fileactions.js

apps/files/js/files.js

apps/files/js/jquery-visibility.js

apps/files/l10n/bg_BG.php

apps/files/l10n/da.php

apps/files/l10n/de.php

apps/files/l10n/es.php

apps/files/l10n/es_AR.php

apps/files/l10n/et_EE.php

apps/files/l10n/eu.php

apps/files/l10n/fi_FI.php

apps/files/l10n/gl.php

apps/files/l10n/hu_HU.php

apps/files/l10n/lv.php

apps/files/l10n/nl.php

apps/files/l10n/pt_BR.php

apps/files/l10n/ru_RU.php

apps/files/l10n/sk_SK.php

apps/files/l10n/sv.php