Is your entire UI translated or just the variable in your log?
If it’s just the variable then those Chinese(?) characters are supposedly the name of a variable in the screenshot you posted. It seems unlikely, that you created that variable yourself.
Perhaps the variable name is corrupt, and the corrupt name just so happens to appear like Chinese characters. If this is the case, I would try refreshing all nodes in the blueprint and if there’s no change, see if you have the same issue with an empty project to narrow down whether or not the issue is related to your current project.