Unfortunately this is one of those things that we just don't really have anyone for to focus on.
Another problem is that quite a bit of text has changed AFTER it had already been localized which is obviously also not ideal, so personally I don't really feel comfortable making localized strings when I know that that code still has to be updated in any case (Which usually means the text gets a revamp as well).
It would be great to have a completely translated manual for example.... but the manual that you can currently find under TacBF Help in the map is severly outdated on a lot of topics and the Field Manual entries that I started making for a few things need work as well...
Then there's the problem with formatted text, like the flexiMenu buttons that have a hotkey. With localized text it's basically impossible to predict overlapping keys there and using number keys is often not an ideal solution either (because in a lot of cases there's not really a predictable order of buttons)