add other languages in Sony Ericsson phone?

Hello.....everyone! I'm new here.:a002
Can I know how to add other languages in Sony Ericsson phone? :a003

It's easy, you have several alternatives.

I could install another firmware that is your region to include your language.

Or climb the languages you want to add to your route.

What language would you add?
And what is your phone?

my region is "bangladesh". i want "bengali" language. my mobiles are "DB2010_w550_r4cb020_red_cid49" and "DB2010_k510_r4ea031_red_cid49".