Improve the loading screen error message

- Fix subtitle if the previously selected song had the same title

public/src/views/about.html

@@ -2,7 +2,7 @@
 	<div class="view">
 		<div class="view-title stroke-sub"></div>
 		<div class="view-content"></div>
-		<div id="diag-txt"></div>
+		<div class="diag-txt"></div>
 		<div class="left-buttons">
 			<div id="link-issues" class="taibtn stroke-sub link-btn">
 				<a target="_blank"></a>

public/src/views/loader.html

@@ -2,3 +2,10 @@
 	<div class="progress"></div>
 	<span class="percentage">0%</span>
 </div>
+<div class="view-outer loader-error-div">
+	<div class="view">
+		<div class="view-content">An error occurred, please refresh</div>
+		<div class="diag-txt"></div>
+		<span class="debug-link">Debug</span>
+	</div>
+</div>