Gadget export
To export the charinsert-core gadget, click on "Daxe" 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:
* charinsert-core[ResourceLoader|hidden|dependencies=jquery.textSelection,user,mediawiki.storage]|charinsert-core.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.