Gadget export
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To export the summaryButtons 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:
* summaryButtons[ResourceLoader|hidden|default|type=general|dependencies=mediawiki.ui.button,mediawiki.util]|summaryButtons.js|summaryButtons.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.