Gadget export
To export the Extra-Editbuttons 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:
* Extra-Editbuttons[ResourceLoader|default|dependencies=mediawiki.util|default|rights=minoredit]|Extra-Editbuttons.js|Extra-Editbuttons-persiantools.js|Extra-Editbuttons-persianwikitools.js|Extra-Editbuttons-dictionary.js|Extra-Editbuttons-autoed.js|Extra-Editbuttons-botworks.js
You must have appropriate permissions on destination wiki (including the right to edit system messages) and import from file uploads must be enabled.