Originally written by yjfvictor at https://github.com/wikimedia/language-data/pull/58 Updated more conservatively by Amir E. Aharoni. This is probably a transition to allow the splitting to two variants. "cdo" will be reconfigured later once the transition in other MediaWiki-related properties will be over. Co-authored-by: yjfvictor <yjf_victor@hotmail.com>