[tx-robot] updated from transifex

apps/files_versions/l10n/ru_RU.php

core/l10n/ca.php

core/l10n/el.php

core/l10n/it.php

core/l10n/nl.php

core/l10n/pt_PT.php

l10n/ca/core.po

l10n/ca/lib.po

l10n/el/core.po

l10n/el/lib.po

l10n/el/settings.po

l10n/it/core.po

l10n/it/lib.po

l10n/nl/core.po

l10n/nl/lib.po

l10n/pt_PT/core.po

l10n/pt_PT/lib.po

l10n/ru_RU/files_versions.po

l10n/si_LK/settings.po

l10n/templates/core.pot