Use this files for unbranding :
MAIN - W850_R1KG001_MAIN_GENERIC_CY_RED52
FS - W850_R1KG001_FS_EUROPE_5_RED52 and
CUSTPACK - HB1-06_Gen_CDA102568_14_R5A_GENERIC_EUROPE_5 , because I think this languages will be fine for you ( EUROPE_5 - English - French - German - Italian ). If I'm wrong just say what language do you need and will be changed.Use this tutorial for unbranding XS++ 3.1 Guide-Flashing, Customizing, Recovering - Top Sony Forums and this for puting flash menus Put flash menus on your phone - only flash supported phones - Top Sony Forums