Nokia 1 is not completely metal body. It has metal chassis frame and the housing is made of polycarbonate material.
Yes, Nokia 1 have the removable battery.
Yes, Nokia 1 does have the support for 18 Indian languages. You can change the system language from the English to Punjabi easily.
You can record 720p resolution videos from Nokia 1.
The Nokia 1 is an inexpensive Android smartphone, and as you can tell from the Nokia 1 review, you very much get what you pay for.