Some base (en-us) XUI files contain two or more elements with identical name attributes in a same level. As a result, proper translation of those UI elements is impossible.
This is a same mistake as VWR-4125, that was apparently fixed in 1.19.1. I verified the dupliate names in 1.20.0.84432 and concluded that the duplicates in 1.20.0.84432 are all new ones. That is, all XUI elements having duplicate names are new ones introduced in 1.20.0 RC...
Anyway I produced a patch to fix this issue, as before. It is "1.20.0-xui-duplicates.patch".