How to keep only English and Tamil languages?

I send quotes and invoices mostly in tamil language. Sometimes in English for who dont know tamil.

When priring the quotes and invoices, I have to choose tamil in the language list, where I have to scroll down a lot.

It will be good in the language list, I have only tamil and English.

I tried to delete all other languages in the language list. They are not deletable.

How to solve this?