Hey I could do this but do you actually think that anyone that reads or writes Bangla would actually spend time reading our Bengali text on this forum? I just did a post on this forum a few days ago stating how useless Hindi translations are, that goes the same for any local language here.
Plus, thanks to the numerous scams from chit funds, not many in Bengal actually trust Bitcoin. Apart from the elite & IT / programming audience that you may find. And those people, they can read and write English just fine.
So unless you're going to print this translated Bengali text on a local newspaper like Bartaman or Anandabazar etc don't bother with this. IMO.