Who are there to contribute for Nepali?
Let us work together for the betterment of Nepal.
You can contact the language pack maintainer at https://lang.moodle.org/user/profile.php?id=76709 and discuss how you can help.
There is an old document on https://docs.moodle.org/dev/Translation_priority which give you some idea on what to do first.
Two people, 50 strings per day and in 8 months you have a complete language pack!