Peter,
I agree that's the best behavior, but it doesn't do that for me. If I search for 'add' when I have locale English, target language Russian, I get 3 Add (s) at the top (add/add/Add), but much later there is acs-kernel.common_add which also has English key of Add but is not sorted in with the first three.
Ideally that would be sorted up with the others - all case insensitive on the sort, so add and Add would appear together.
You provided a salient example - researching this, I realized I missed the acs-kernel.common_add copy of Add because I didn't see it.
Thanks!