Congratulations!
But wait... where have you got v2.60 multilanguage ?
Concerning unknown.bin... GCD files don't store any section names like "boot.bin" or "fw_all.bin" or "unknown.bin". Those names are assigned by RGN_Tool.
So "italian.bin" or "unknown.bin" doesn't make any difference.
And of course, you are free to make a new GCD, it won't harm.