Fixed about dialog translations

src/app/dialogs/about-dialog/about-dialog.component.html

@@ -1,9 +1,11 @@
-<h4 style="position: relative" mat-dialog-title i18n="About dialog title">About YoutubeDL-Material<span class="logo-image">
-    <a [href]="projectLink" target="_blank">
-        <img style="width: 32px;" src="assets/images/GitHub-64px.png">
-    </a>
-    <img style="width: 32px; margin-left: 15px;" src="assets/images/logo_128px.png">
-</span></h4>
+<h4 style="position: relative" mat-dialog-title><ng-container i18n="About dialog title">About YoutubeDL-Material</ng-container>
+    <span class="logo-image">
+        <a [href]="projectLink" target="_blank">
+            <img style="width: 32px;" src="assets/images/GitHub-64px.png">
+        </a>
+        <img style="width: 32px; margin-left: 15px;" src="assets/images/logo_128px.png">
+    </span>
+</h4>
 <mat-dialog-content>
     <div style="margin-bottom: 5px;">
         <p>