Generates Namespaces.scala and Redirect.scala. Must be run with core/ as the current directory.
FIXME: This should be used to download the data for just one language and maybe store it in a
text file or simply in memory. (Loading the stuff only takes between .2 and 2 seconds per language.)
Currently this class is used to generate two huge configuration classes for all languages.
That's not good.
TODO: error handling. So far, it didn't seem necessary. api.php seems to work, and this
class is so far used with direct human supervision.