Hi @Anonymous - Here is my take on what you want to do:
You want to create your course in Hindi. Of course, by doing so, you will be greatly restricting your course to those students who speak the language. So, not only are you creating a course where there are thousands of competing courses, you are limiting your students to those who speak Hindi. You should be prepared to to have it take a long time for your course to gain any sort of traction.
I don't believe you will face any difficulties with Udemy checking your course because it is in Hindi.