[tx-robot] updated from transifex

apps/files/l10n/el.php

apps/files/l10n/nl.php

apps/files_encryption/l10n/el.php

apps/files_sharing/l10n/el.php

core/l10n/el.php

core/l10n/it.php

l10n/af_ZA/core.po

l10n/af_ZA/lib.po

l10n/ar/core.po

l10n/ar/files.po

l10n/ar/files_external.po

l10n/ar/files_trashbin.po

l10n/ar/lib.po

l10n/ar/settings.po

l10n/ast/core.po

l10n/ast/files.po

l10n/ast/files_external.po

l10n/ast/files_trashbin.po

l10n/ast/lib.po

l10n/ast/settings.po