Updating the commit sha to 4ac734c15a96f9e16fd12330d0cb8de82274f700
as somehow automating picked up a different commit
(probably tagged by mistake upstream)
The Linguist-defined language IDs are important to our use case because they are
used as database identifiers. This adds a new generator to extract the language
IDs into a map and uses that to implement GetLanguageID.
Because one language has the ID 0, there is no way to tell if a language name is
found or not. If desired, we could add this by returning (string, bool) from
GetLanguageID. But none of the other functions that take language names do this,
so I didn't want to introduce it here.
