The data*.cab can be descompressed with i6comp...
I´ve read the tutorial
here but it don´t says nothing about delete archives (foreign languages) and compress the files in a new cab...

Sorry for may bad english
DONE !!!
@echo off
i6comp d -g4 data1.cab *.*
pause
i6comp d -g5 data1.cab *.*
pause
i6comp d -g6 data1.cab *.*
pause
i6comp d -g10 data1.cab *.*
pause
i6comp d -g11 data1.cab *.*
pause
i6comp d -g13 data1.cab *.*
pause
i6comp d -g15 data1.cab *.*
pause
i6comp d -g16 data1.cab *.*
pause
i6comp d -g17 data1.cab *.*
pause
i6comp d -g23 data1.cab *.*
pause
i6comp d -g24 data1.cab *.*
pause
i6comp d -g26 data1.cab *.*
pause
ADVICE: This script is ONLY for spanish. For other language do "icomp6 g data1.cab", numerate the groups (0..), select the languages to delete
I´ve got only one problem, at install appears a crc error in 2200*.mod file... the solve is extract only this archive (from original) and replace it in the new cabs.
Final size: 4.3 giga