Improve header of add to playlist dialog, making the dialog more compact

front/src/components/playlists/PlaylistModal.vue

 <template>
   <modal @update:show="update" :show="$store.state.playlists.showModal">
     <div class="header">
-      <translate translate-context="Popup/Playlist/Title/Verb">Manage playlists</translate>
-    </div>
-    <div class="scrolling content">
-      <div class="description">
-        <template v-if="track">
-          <h4 class="ui header"><translate translate-context="Popup/Playlist/Title">Current track</translate></h4>
-          <span
+      <template v-if="track">
+        <h2 class="ui header">
+          <translate translate-context="Popup/Playlist/Title/Verb">Add to playlist</translate>
+          <div
+            class="ui sub header"
             translate-context="Popup/Playlist/Paragraph"
             v-translate="{artist: track.artist.name, title: track.title}"
             :translate-params="{artist: track.artist.name, title: track.title}">
             "%{ title }", by %{ artist }
-          </span>
-          <div class="ui divider"></div>
-        </template>
-
-        <playlist-form :key="formKey"></playlist-form>
-        <div class="ui divider"></div>
-      </div>
+          </div>
+        </h2>
+      </template>
+      <translate v-else translate-context="Popup/Playlist/Title/Verb">Manage playlists</translate>
+    </div>
+    <div class="scrolling content">
+      <playlist-form :key="formKey"></playlist-form>
+      <div class="ui divider"></div>
       <div v-if="playlists.length > 0">
         <div v-if="showDuplicateTrackAddConfirmation" class="ui warning message">
           <p translate-context="Popup/Playlist/Paragraph"