According to Gmail official blogpost "Indian culture is diverse, with more than 100 languages and thousands of alphabets used every day.Starting today, we are rolling out support for 6 Indic languages in Gmail on the feature phone browser: Bengali, Gujarati, Kannada, Marathi, Tamil, and Telugu."
To change you Gmail display language follow the below steps:
- Click the gear icon in the upper right, then select Settings.
- At the top of the page, select a language from the Gmail display language drop-down menu in the Language section.
- Click Save Changes at the bottom of the page.
Now your Gmail interface will appear in the language of you have selected above. Note Gmail's display language doesn't affect the language in which your messages are sent and received.
[via Official Gmail Blog]