[tx-robot] updated from transifex

apps/files/l10n/th_TH.php

apps/files_external/l10n/el.php

apps/files_external/l10n/ru_RU.php

apps/user_webdavauth/l10n/ca.php

apps/user_webdavauth/l10n/de_DE.php

apps/user_webdavauth/l10n/el.php

apps/user_webdavauth/l10n/it.php

apps/user_webdavauth/l10n/pt_PT.php

core/l10n/el.php

core/l10n/ru_RU.php

l10n/ca/settings.po

l10n/ca/user_webdavauth.po

l10n/de/settings.po

l10n/de_DE/core.po

l10n/de_DE/settings.po

l10n/de_DE/user_webdavauth.po

l10n/el/core.po

l10n/el/files_external.po

l10n/el/settings.po

l10n/el/user_webdavauth.po