[tx-robot] updated from transifex

apps/files/l10n/si_LK.php

apps/files/l10n/sr.php

apps/files/l10n/vi.php

apps/files_external/l10n/vi.php

apps/user_ldap/l10n/vi.php

apps/user_webdavauth/l10n/ca.php

apps/user_webdavauth/l10n/de.php

apps/user_webdavauth/l10n/de_DE.php

apps/user_webdavauth/l10n/el.php

apps/user_webdavauth/l10n/es.php

apps/user_webdavauth/l10n/fi_FI.php

apps/user_webdavauth/l10n/it.php

apps/user_webdavauth/l10n/nl.php

apps/user_webdavauth/l10n/pl.php

apps/user_webdavauth/l10n/ru.php

apps/user_webdavauth/l10n/ru_RU.php

apps/user_webdavauth/l10n/vi.php

core/l10n/si_LK.php

core/l10n/vi.php

l10n/ar/settings.po