Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */

/* Navigation Popups */
/* Currently Disabled
mw.loader.load('/load.php?modules=ext.gadget.Navigation_popups');
window.popupAdminLinks = false;
window.popupActionsMenu = false;
window.popupStructure = 'lite';
window.popupSubpopups = false;
window.popupSummaryData = false;
*/

$(document).ready(function() {
	var goToDogcraft = document.querySelectorAll("#p-Go_to_Dogcraft > a");
	goToDogcraft[0].setAttribute("href", "//dogcraft.net");
	
	var indicator = document.querySelectorAll(".mw-indicators");
	var indicatorHTML = indicator[0].innerHTML;
	/*classList.add("mw-indicators mw-body-content")*/
	document.getElementById("tagline").innerHTML = indicatorHTML;
});

MediaWiki

Common.js