The configuration dialogs of the Lightproof grammar checking extensions (that come with English, Hungarian, and Russian spelling tools) are not localized, although they are translated at Pootle. The context menu suggestions coming from these extensions seem not to be translatable at all, at least I couldn't find the strings at Pootle. Tried with Estonian UI on Debian Lenny and Windows XP SP3, both 32-bit.
Looks fixed in 3.5.1 RC1.