Hi, and thank you for your interest!
yast-proxy is being translated using Weblate, a web tool designed to ease translating for both developers and translators.
Translation project for yast-proxy into Bengali currently contains 70 strings for translation and is 87.1% complete.
If you would like to contribute to translation of yast-proxy, you need to register on this server.
Once you have activated your account just proceed to the translation section.