I have discovered that the Bangla fonts do not often work; you may see all questions, boxes, or some senseless signs. There are two reasons for that. One is due to the fact that the relevant machine-cum-system has not been fed with the proper font package. A smart person can surely tackle this ( I wish I could suggest you what to do then). Another reason is that it is due to the browser; some browser may fail to support the fonts.
I therefore prefer to write in English.