FACTS

Any combo of Cust pack and FS will work.
you choose correct combo >> all languages will work
you choose wrong combo >> only common languages work. Only English in many cases

your problem >> you dint upload cust pack properly !! 100% i am sure ..!!

connect phone ( usual process )
unzip the customization pack ( use the cust pack which goes with the FS of your choice or create one which is very easy )

you will find a folder named "tpa" in it

now in xs++ directory on PC, in the directory where u have xs++.exe create a new folder named "own_custpack"

copy the "tpa" folder into this "own_custpack" folder the path of custom files should be like own_custpack/tpa/preset/custom...

open xs++ and connect fone check only customize file system

now under phone model select 'Own Custpack'
under CDA and Region, select '/own_custpack'

now hit flash...
now in few seconds custom files will be added to your phone and done
Start your phone !! Wait for some time !!