Gadget export
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To export the TranslationAdder 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:
* TranslationAdder[ResourceLoader|default|dependencies=ext.gadget.Editor,ext.gadget.LegacyScriptsNewNode,mediawiki.cookie,ext.gadget.LanguageUtils,mediawiki.util,ext.gadget.TranslationAdder-Data]|TranslationAdder.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.