prevent duplicate inflection button

src/components/Header.vue

@@ -61,7 +61,7 @@
     <span v-if="$store.state.showInflectionNo" class="inflection_classes">{{lemma_group.inflection_classes}}</span>
     </span>
 
-    <InflectionButton class="inflection-button" :lemmas="$parent.article.lemmas" :dictionary="dictionary" :article_id="$parent.article.article_id"/>
+    <InflectionButton v-if="i == lemma_groups.length-1" class="inflection-button" :lemmas="$parent.article.lemmas" :dictionary="dictionary" :article_id="$parent.article.article_id"/>
 
     </div>