Gadget export
To export the confirmationRollback-mobile gadget, click on "Download" button, save the downloaded file, go to Special:Import on the destination wiki and upload it. Then add the following to MediaWiki:Gadgets-definition page:
* confirmationRollback-mobile [ResourceLoader |default |rights=rollback |dependencies=mediawiki.util] |confirmationRollback-mobile.js
You must have appropriate permissions on the destination wiki (including the right to edit system messages) and import from file uploads must be enabled.