Right UploadWizard's description language list is identical to the MediaWiki interface language list. We include things like Simple English, Serbian Cyrillic, Formal German, etc. Some of these aren't actually languages, but rather scripts or dialects, thus Commons doesn't have language templates for them.
The full list of Commons language templates can be found here:
http://commons.wikimedia.org/wiki/Category:Language_templates (327 currently)
Version: unspecified
Severity: normal