In Maintenance view, when a single mail is selected, the first action on the left reads "Delete email". When a second is selected, too, it changes to "Delete emails" (plural). Other labels like "Move Item To..." do not change. I had expected that these other labels changed, too. Observed in 4:4.5~20100928.1180427-1maemo1.1180334_100308 and earlier versions. The same issue might be present in other applications of the kontact-mobile suite, too.