But the file is in the download section:Downloads - R1KG001_RED52 - Top Sony Forums

Here:
Downloads - R1KG001_RED52 - K800_R1KG001_FS_EUROPE_3_RED52 - Top Sony Forums

Heres, the thread on how to download from the download section:
How to get access to Download Area? - Top Sony Forums

A thread on how to add language:
how to add languages to your phone - Top Sony Forums