fikset absurd komplisert kode for artikkel-overskrifter

src/components/Header.vue

 <!-- eslint-disable -->
 <template>
   <div>
-    <h1 class="article_header" v-for="(lemma, index) in lemmas" :key="index">
-      {{lemma.lemma}}{{index+1 < lemmas.length ? ',' : ''}} </h1>
+    <h1 class="article_header">{{header_text}}</h1>
       {{group_list}}
       <details title="Klikk for å se bøyninger" @toggle="toggle()">
         <summary>{{dictionary == 'bob' ? 'Bøyning' : 'Bøying'}}</summary>
@@ -44,6 +43,9 @@ export default {
     article_id: Number
   },
   computed: {
+    header_text: function() {
+      return this.lemmas.map(lemma => lemma.lemma).join(', ')
+    },
     dict_label: function() {
       return {
         'bob': 'BOKMÅL',