use textref header for textprod with title

src/pages/Introduction.vue

@@ -47,7 +47,7 @@ export default {
   },
 
   computed: {
-    ...mapGetters(['visited']),
+    ...mapGetters(['visited'])
   },
 
   methods: {

src/pages/library/LibraryTree.vue

@@ -41,7 +41,7 @@
             active hovered
             @click="onNodeClick(activeNode.data)"
           >
-            <template v-if="activeNode.data.type === 'prod'">
+            <template v-if="activeNode.data.type === 'prod' && !(activeNode.data.preTitle || activeNode.data.italTitle)">
               {{ $t('variants.' + activeNode.data.variant) }}<br>
             </template>