The site language can be configured with a dropdown under Admin → General. However, for non-default languages you need to install the respective language files first, and AFAICS there is no Hindi translation yet, so you'd have to create it.
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.
April 20, 2021: Q2A 1.8.6 released!