Added variant update functionality.

frontend/app/components/variant/variantCreate.vue

@@ -22,7 +22,7 @@ async function create() {
 
     const variant: Variant = new Variant(0, weight.value, ean.value, name.value, description.value, ingredients.value);
 
-    await store.addVariant(store.article.id, variant);
+    await store.addVariant(variant);
 
     closeDialog();
   }
@@ -73,7 +73,7 @@ function clearVariables() {
           mdi-plus-thick
         </v-icon>
 
-        Artikel erstellen
+        Variante erstellen
 
         <v-progress-circular v-if="loading" indeterminate :size="15" :width="2"></v-progress-circular>
       </v-card-title>