Some further cleanup of presentational stuff

src/components/presentational/LoadingOverlay.js

@@ -0,0 +1,21 @@
+import React from 'react';
+import copy from '../../js/data/copy.json';
+
+const LoadingOverlay = ({ isLoading, language }) => {
+  let classes = 'loading-overlay';
+  classes += (!isLoading) ? ' hidden' : '';
+
+  return (
+    <div id="loading-overlay" className={classes}>
+      <div className="loading-wrapper">
+        <span id="loading-text" className="text">{copy[language].loading}</span>
+        <div className="spinner">
+          <div className="double-bounce1" />
+          <div className="double-bounce2" />
+        </div>
+      </div>
+    </div>
+  );
+};
+
+export default LoadingOverlay;