fixes #7, add es locale

middleware/i18n.js

@@ -2,10 +2,10 @@ import acceptLanguage from 'accept-language'
 export default function ({ req, app, store }) {
   if (process.server) {
     const acceptedLanguages = req.headers['accept-language']
-    const supportedLanguages = ['en', 'it']
+    const supportedLanguages = ['en', 'it', 'es']
     acceptLanguage.languages(supportedLanguages)
     const lang = acceptLanguage.get(acceptedLanguages)
-    store.commit('setLocale', lang || 'it')  
+    store.commit('setLocale', lang || 'it')
     app.i18n.locale = store.state.locale
   }
 }