Could you check whether the same happen on default Joomla! template like Beez ? Maybe it is just missing phrase is translation so if you check it with Beez we will be sure where is the problem.
i tested this with beez_5 and beez_20 template, but same issue. I checked language files and see correctly entrys. I do not know, where i can fix this issue.
By the link in top case your can see issue with activate beez template.