Phone Language Upgradation

Upgrading your phone : Hardware upgrade isnt possible except a possible external memory to the maximum limit. OS cannot be changed, nor can OS of a phone be upgraded. So upgrade is out of question.

As far as getting other languages, I am not sure if re-flashing might be the solution you are looking for. But in any case, its something that cannot be done by you. You might try to contact the nearest authorised service centre and see what they got to offer you.