Added lang attribute to html tag

components/mixins/seo.js

@@ -0,0 +1,9 @@
+export default {
+  head() {
+    return {
+      htmlAttrs: {
+        lang: this.$i18n.locale()
+      }
+    }
+  }
+}

layouts/blank.vue

@@ -7,3 +7,11 @@
     </ds-container>
   </div>
 </template>
+
+<script>
+import seo from '~/components/mixins/seo'
+
+export default {
+  mixins: [seo]
+}
+</script>

layouts/default.vue

@@ -79,12 +79,14 @@
 import { mapGetters } from 'vuex'
 import LocaleSwitch from '~/components/LocaleSwitch'
 import Dropdown from '~/components/Dropdown'
+import seo from '~/components/mixins/seo'
 
 export default {
   components: {
     Dropdown,
     LocaleSwitch
   },
+  mixins: [seo],
   computed: {
     ...mapGetters({
       user: 'auth/user',