Cannot translate Configuration page block headers in the Admin theme

Hi,

for some reason i cannot translate block headers on the Configuration page in the admin theme (view screenshot here). Im trying to translate from English to Estonian. The sublinks translate fine, but the headers are stubbornly English. I have tried the Localization Client, the i18n string translation thingie, even tried to translate these from the Menu > Management menu, to no effect.

It feels like string translation is the right place to do it, but it just doesnt work?

Cheers,
Ardi