Ah, you see, that's not an issue with the game itself, but those lousy pak devs. Especially pak192.comic is notirious for it's bad devs who only care for graphics.
Perhaps the attached en.tab is slightly better. Since I rarely play Simutrans in english or pay attention to what's written, I can't really say, but it's the most up-to-date translation file there is (although, might be too new, maybe you need to get a nightly pakset as well?)
If you feel like helping with this, Simutrans and Pak192.Comic are both Open Source, and the Simutranslator is the tool to use: translator.simutrans.com