Dark_Delphin, можно так:
.......
[Languages]
Name: "eng"; MessagesFile: "compiler:Default.isl"
Name: "rus"; MessagesFile: "compiler:Languages\Russian.isl"
[CustomMessages]
rus.Need=Игра займёт на диске:_
eng.Need=Game will take on disk:_
.......
NeedSpaceLabel.Caption := ExpandConstant('{cm:Need}') + MbOrTb(NeedSize);
.......
Остальные по аналогии.
.......
[Languages]
Name: "eng"; MessagesFile: "compiler:Default.isl"
Name: "rus"; MessagesFile: "compiler:Languages\Russian.isl"
[CustomMessages]
rus.Need=Игра займёт на диске:_
eng.Need=Game will take on disk:_
.......
NeedSpaceLabel.Caption := ExpandConstant('{cm:Need}') + MbOrTb(NeedSize);
.......
Остальные по аналогии.