fikset linker til underartikler

src/components/SubArticle.vue

 <template>
   <li class="sub_article">
     <span class="sub_article_header">
-      <router-link :to="'./' + body.article_id"  @click.native="article_link_click(body)">
+      <router-link :to="link_prefix + body.article_id"  @click.native="article_link_click(body)">
         {{body.lemmas[0]}}
       </router-link>
     </span>
@@ -23,6 +23,11 @@ export default {
   components: {
     DefElement
   },
+  computed: {
+    link_prefix: function() {
+      return this.$route.params.lemma ? '../' : './'
+    }
+  },
   beforeCreate: function () {
     this.$options.components.Definition = require('./Definition.vue').default
   },