Gadget-breadcrumbs.js

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$(document).ready(function() {
	
	/*$("#alertbutton-domino").click(function(){
		mw.messages.set({'sandbox-test': 'Testing'});
		var wiki_sandbox_obj = new mw.Message( mw.messages, 'sandbox-test' );
		mw.log( wiki_sandbox_obj.text() );
		mw.notify( mw.message( 'sandbox-test' ) );
	});*/
	
	var worldCat = '';
	for (let i = 0; i < mw.config.get('wgCategories').length; i++) {
		if ( mw.config.get('wgCategories')[i].includes('Survival ') == true) {
    		worldCat = mw.config.get('wgCategories')[i] + '';
        	break;
		}
	}
	$('#breadcrumbs-test').text('' + mw.config.get('wgFormattedNamespaces')[mw.config.get('wgNamespaceNumber')] + ' > ' + worldCat + ' > ' + mw.config.get( 'wgTitle' ));
		
});

MediaWiki

Gadget-breadcrumbs.js