Welcome to the forum! As you might have noticed already, while Bangla is available as a “content language”, it is not yet available as an “interface language”.
Having Bangla as an “interface language” as well will enable participants to access the forum interface (tabs, categories, menus and others) in Bangla.
Please vote if you also want Bangla as one of the forum interface languages.
The Bangla/Bengalí translations are being contributed here: Crowdin Enterprise
The main file to translate is this “client.yml”, which right now is only at 5% of translation.
There is a topic in the Discourse forum about “the sweetest language for the world”. I just commenteded there to see whether there is further interest in Bengali support. Add The sweetest language of the world - translations - Discourse Meta