Optimize fetching data from multiple endpoints

[killua-eu]

glued-react/src/plugins/Core.js

Line 52 in 153e063

if (this.state.contentEnforce === null) {

and lines 25-46 ... more elegant way to do this? Also auth test fail is always bound to return an empty dataset and a 403 error. if it returns something, then authentication borked. Way to handle dis?