Updated ssr option for SEO.

Signed-off-by: Pavel Kirilin <win10@list.ru>

store/index.js

@@ -0,0 +1,11 @@
+export const state = () => {
+  return {
+    lang: 'ru',
+  }
+}
+
+export const mutations = {
+  set_lang(state, value) {
+    state.lang = value
+  },
+}