We have our Confluence Instance set to german. If you select and hover over a Term when highlighting is disabled, there is the option to “show term definition”. a proper localisation would be something akin to “Definition anzeigen” or even better, “Im Glossar nachschlagen” - which is a slightly different meaning, but more eloquent.
Also, if that does not find anything, It creates a dialog that says “Momentan gibt es keine Bedingungen. [Add a new term]” The button should be labelled “Begriff hinzufügen” as it is on the terms overview. The text is a little bit clunky, as it Means “there are no conditions met” when translated back to english. It should be more along the lines of: “Es gibt noch keinen Eintrag für diesen Begriff” (there exists no entry) or “Es wurde kein Eintrag für diesen Begriff gefunden” (no entry was found).