These are static versions of mediawiki configurations, necessary to
run parsoid offline and to run parserTests.

The JSON files are the cached results of a siteinfo query like:
  curl 'https://en.wikipedia.org/w/api.php?action=query&format=json&prop=&meta=siteinfo&siprop=namespaces%7Cnamespacealiases%7Cmagicwords%7Cfunctionhooks%7Cextensiontags%7Cgeneral%7Cinterwikimap%7Clanguages%7Cprotocols%7Cspecialpagealiases

To generate/regenerate:

 $ for lang in ar ban be-tarask ca cs de en eo es fa fi fr is kaa ln nl ru sr tr zh ; do \
     php tools/SyncBaseConfig.php --domain=${lang}.wikipedia.org ; \
   done