The changes of @0 to @5000 lines in setup.tra are the reason, it prevents the installation of the mod in every language!
By returning the line to @0 the component "edwin romance" can be installed !
I can confirm after running into this issue myself, that this solution solves the problem. The installer dialog messes up slightly but does not further impede the installation process. However if further mods are installed afterwards weiDU will throw errors like this:
Installing [Haer'Dalis Friendship for BG2: ToB] [v1.2] Copying 1 file ... Copying and patching 1 file ... Copying 1 file ... Copying and patching 1 file ... Copying 1 file ... Copying and patching 1 file ... loading 1 tra file Copying 1 file ... Appending to files ... Compiling 1 dialogue file ... Extending game scripts ... Compiling 1 dialogue file ... Extending game scripts ... ERROR: No translation provided for @50000 Continuing despite error. [.\lang\en_us\dialog.tlk] created, 370777 string entries SUCCESSFULLY INSTALLED Haer'Dalis Friendship for BG2: ToB Press ENTER to exit.