Gadget export
To export the LegacyScripts gadget, click on "ښکته کول" 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:
* LegacyScripts[ResourceLoader|default|dependencies=site,mediawiki.util,mediawiki.toolbar]|legacy.js|legacy.css
You must have appropriate permissions on the destination wiki (including the right to edit system messages) and import from file uploads must be enabled.