1. Don't need Parents Birth Certificate for this application unless you are also sponsoring their Parents (your grandparents)
2. My parents had the same issue. Their original certificate was in Marathi. They went to the municipal office of the City they were born and got reissued certificates. New and shiny, and in English.
3. Didn't want to go the translation route myself.
See info below. This is categorized per state. The catch is:
1. The old records need to exist
2. Need about 2-3 days for this process.
I had asked my parents to start this process early-on (in February) this year.
https://services.india.gov.in/servi...n=district&state_id=&district_name=&pin_code=