remove unused code

src/components/InflectionButton.vue

@@ -15,8 +15,6 @@
 
 <script>
   /* eslint-disable */
-import helpers from '../utils/helpers.js'
-
 import inflectionTable from 'inflection-table'
 
 export default {
@@ -27,9 +25,6 @@ export default {
     article_id: Number
   },
   computed: {
-    group_list: function() {
-      return helpers.group_list(this.lemmas, this.dictionary)
-    },
     inflection_classes: function() {
       let inf_classes = new Set()
       let ureg = false