add space before type name in download popup title

fixes #3599

client/src/app/shared/shared-video-miniature/video-download.component.html

@@ -3,7 +3,7 @@
     <h4 class="modal-title">
       <ng-container i18n>Download</ng-container>
 
-      <div *ngIf="videoCaptions" ngbDropdown class="d-inline-block">
+      <div *ngIf="videoCaptions" ngbDropdown class="d-inline-block ml-1">
         <span id="dropdownDownloadType" ngbDropdownToggle>
           {{ type }}
         </span>