I have added Hindi, Marathi and Kannada to our translation portal:

https://crowdin.com/project/mastodon

Mastodon — Translation Project on Crowdin

Help us translate Mastodon and bring it to the world!

Crowdin
@Gargron धन्यवाद Thank you 🙏🏼🙏🏼
@skatsoil @Gargron malayalam and bengali would be other two languages I suggest to add..