In looking at the localization page, it seems consistent that the language abbreviation is lowercase, and the country abbreviation is uppercase.  But when the name of the language is spelled out, there seems to be an inconsistency.  For example, for Spanish, es-ES is described as español, but for es-MX and es-UY it is Español.  For Portuguese, pt-PT is português and pt-BR is Português.

Is there some specific convention that should be observed?  Is this convention part of the original language pack?  Or is it built into DNN?  Will loading a language pack override any convention built into DNN?  For example, the locale "català (català)" is built into DNN even though there is currently no Catalan language pack available.  Will the lowercase convention it currently observes be overridden by any future Catalan language pack?

I wasn't asking why there are more locales than language packs.  I am surprised you interpreted that from my post.  My question was should the language packs conform to the naming convention provided by ASP.NET, and are any problems created when they do not?

My purpose for the statement

For example, the locale "català (català)" is built into DNN even though there is currently no Catalan language pack available.

was to determine if the uploading of a language pack changed the nomenclature of the entry in the locale.  Since there was no Catalan language pack, the appearance of that locale in the list would not be influenced by any installed pack.  The question was whether something exists in the language pack that would be able to control how those entries appeared in the locale list.  Your implication is that they do not.

I finally did the obvious thing and looked at a clean install of 3.1.1 and saw that the same lowercase vs. uppercase discrepancies existed without having any language packs installed (in my previous statements I was using my main web site as my reference which has several  language packs installed).  So the next question is, why is ASP.NET inconsistent in how it displays the variations of the same language (such as using uppercase Português for pt-BR and lowercase português for pt-PT)?  French, English, and German are consistent in their cases, but Spanish and Portugese are not.