merge master into filesystem

3rdparty/Archive/Tar.php

README

apps/files/admin.php

apps/files/css/files.css

apps/files/js/filelist.js

apps/files/js/files.js

apps/files/l10n/de.php

apps/files/l10n/de_DE.php

apps/files/l10n/eo.php

apps/files/l10n/nb_NO.php

apps/files/l10n/nl.php

apps/files/l10n/ru.php

apps/files/l10n/si_LK.php

apps/files/l10n/sk_SK.php

apps/files/l10n/vi.php

apps/files/templates/part.list.php

apps/files_encryption/l10n/de_DE.php

apps/files_external/ajax/removeRootCertificate.php

apps/files_external/l10n/de_DE.php

apps/files_external/l10n/el.php