Translations:Manual:$wgExtraInterlanguageLinkPrefixes/16/en

To add a link label for "demo:Demo for xyz-setting" as well as "sand:Sandbox for xyz setting" you can now edit the system message "MediaWiki:Interlanguage-link-demo" and add "Demonstration" as well as "MediaWiki:Interlanguage-link-sand" and add "Sandbox" on the documentation wiki. As a result the links will render as "Demonstration" and "Sandbox" respectively.