RECOMMENDED The most reliable way of change the footer text at this point in time, is again editing the source files. You can change the footer text by searching for the footer.hbs file.

<!-- FOOTER TEXT: You can change the footer text here. -->

<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>

<!-- end FOOTER TEXT -->

Another way to edit the text is by editing the property in preferences.js as mentioned in Theme Setup. However, this method basically changes the text after the JavaScript is loaded, browser who do not support this won't see the text. That's why, if left empty "textFooterOverride": "", the source code will be used as mentioned above (which is recommended).

setPreferences({
   "links": {
      "discord": "<https://www.google.com>",
      "server": "play.sparox.net"
   },
   "content": {
      "refGuides": true,
      "refStore": true,
      "textFooterOverride": ""
   }
});