How can we improve WHMCS?

Right now when you choose a language you see a list of English languagues names (exonyms), from the perspective of an English native speaker this makes sense but for someone non-native English who selects another languague that language name should also be in the local language (endonyms):

For instance in the dropdown i expect to see:

Español (and not Spanish)
Português (and not Portuguese)
Nederlands (and not Dutch)

Currently these values come from the database and you can't edit them in the languague files.
My suggestion would be to add a column to the proper table in the database where the native version of the language is stored and can be displayed to the user in the admin or client area. The values in the database can stay as it is now without impacting the functionality but simply add a display value column and use that in the right places.