I think you can find a few mods which restore some of the BG1 characters (Xan and Kivan I know have mods to put them into BG 2, and then The Darkest Day adds a couple of the BG1 characters as well, but TDD's party members are less fleshed out than those in dedicated mods. Also, I have no idea if you can get TDD anymore)
I have an English version of TDD that adds the spells and items. No reliable English version of the quests/NPCs exists anymore that I am aware of.
If someone wants the file I've got, that could be arranged. Additionally, if anyone actually knows of an English version of TDD's quest/NPCs, that'd be fantastic.
All that I say applies only to myself. You author your own actions and choices. I cannot and will not be responsible for you, nor are you for me, regardless of situation or circumstance.