To change the language on Google, follow these steps:
1. Go to google.com in your web browser
2. Click on the three vertical dots in the top-right corner of the screen
3. In the drop-down menu, click on "Settings"
4. Scroll down to the "Language" section and click on "Edit"
5. In the "Add a language" field, type in "Bengali"
6. Select Bengali from the list of languages that appears
7. Click on the "Add" button
8. Move Bengali up in the list of languages by clicking on the three vertical dots next to it and selecting "Move up"
9. Click on the "Save" button at the bottom of the page