revert removal of choose_locale

src/App.vue

@@ -73,6 +73,13 @@ import TopBar from './components/TopBar.vue'
       }
       document.title = 'Ordbøkene - ' + process.env.VUE_APP_VERSION_LABEL
     },
+    methods: {
+      choose_locale: function(locale) {
+        this.locale_chosen = true
+        this.$store.commit("setLocale", {value: locale, i18n: this._i18n})
+      }
+    },
+
     components: {
       TopBar
     }