Welcome to the forums!
First of all, I recommend you to read the wiki
. This contains all information you need about roms, software and more.
Each ROM has a specific language. It is not possible to change the language without flashing another ROM.
This means you have to download another ROM.
You can download an English shipped ROM but I recommend trying one of the cooked roms here available on the Diamond forum.
Hope this helps you.
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