Manual:$wgDisableTitleConversion

Language, regional and character encoding settings: $wgDisableTitleConversion
Whether to enable language variant conversion for links.
Introduced in version:	1.14.0 (r38784)
Removed in version:	Still in use
Allowed values:	(boolean)
Default value:	`false`
Other settings: Alphabetical \| By function

Details

Whether to enable language variant conversion for links.

This option is slightly misnamed.