I am trying to create language transform, as I want Portuguese:1046, language. I took blank msi, I changed language in it, then compiled it, I got Portuguese msi. Now I want those changes in transform...

  So I took MSITRAN.EXE, and used following commandline to create transform,

msitran.exe [old msi] [changed msi] [path to transform file] -abcde

  My question is, to generate such transform, did I put right parameter? [-abcde]?

Which tool for packaging do you use? If it`s IS than there is possibility under Tools - Create/Apply Transform . Just follow the instruction on the screen

Not according to this article you didn't. You want to GENERATE a transform, not APPLY it so my reading is that you should have used this:

msitran.exe -g [old msi] [changed msi] [path to transform file]

you can generate transform using Orca as well.

1. Edit MSI with Orca.
2. Drag and drop Language transform.
3. Make the changes.
4. Go to Transforms-> Generate Transform.
5. Save MST.

Hope this helps.