In my understading this is a simple "Undo" function, right? In that case the current translation "Zuletzt benutzte Emoji leeren" is probably not correct. "leeren" is used for example for Cache. Clear Cache = Zwischenspeicher leeren. I wrote "Emoji zurücknehmen" and not "Emoji löschen" because "löschen" means "delete" - which is also different from undoing.