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