You can translate namespaces yourself on http://translatewiki.net. All localisation should take place there. Additionally:

• We don't know Nepalese, so we don't know what is "User talk", for example. Don't forget, all namespaces have their corresponding talk namespaces that should be translated, too.
• Nepalese Wikipedia currently does not have a Portal namespace, so it should be created first, which requires community consensus to do that.