There are two Infrastructure > "Domaines" entries in the french translation of Foreman (Web UI):

Domaines: https://foreman.dom/domains
Domaines: https://foreman.dom/realms

The correct french translation for "realms" is "royaumes", as you can see for example in the french translation file of FreeIPA: https://github.com/freeipa/freeipa/blob/master/po/fr.po

More than a translation issue, it's confusing to have entries with the same name and different purposes.