[tx-robot] updated from transifex

apps/files/l10n/ast.php

apps/files/l10n/el.php

apps/files_external/l10n/cs_CZ.php

core/l10n/ast.php

core/l10n/cs_CZ.php

core/l10n/el.php

l10n/ast/core.po

l10n/ast/files.po

l10n/ast/files_trashbin.po

l10n/ast/files_versions.po

l10n/ast/settings.po

l10n/ast/user_ldap.po

l10n/cs_CZ/core.po

l10n/cs_CZ/files_external.po

l10n/cs_CZ/lib.po

l10n/el/core.po

l10n/el/files.po

l10n/el/lib.po

l10n/el/settings.po

l10n/sl/core.po