`/questions` languages does not include the raw name

Currently, the languages listed in `/questions` does not include the raw name of the language. This makes it so it can't be used on the frontend.

Add a new field to the `LanguageSyntax` struct that contains the raw name (and consider renaming the other fields to reduce confusion)

Start at the /questions endpoint and locate the LanguageSyntax struct used to build its language list. Trace how its fields are serialized for the frontend, then add the raw language name and assess whether the existing field names are confusing. Done means /questions exposes the raw name in its language entries and the response remains consistent.

Written by the indexing model from the issue text.