fix date bug

src/components/ArticleFooter.vue

@@ -62,7 +62,7 @@ export default {
     create_citation() {
       let date = new Date();
       let dd = (date.getDate() < 10? '0' : '') + date.getDate()
-      let mm = (date.getMonth() < 10? '0' : '') + date.getMonth()
+      let mm = (date.getMonth() < 9? '0' : '') + (date.getMonth()+1)
       let yyyy = date.getFullYear()
       let link = this.create_link()
       let citation = {"bm": `«${this.article.lemmas[0].lemma}». I: <em>Bokmålsordboka.</em> Språkrådet og Universitetet i Bergen. &lt;<a href='${link}'>${link}</a>&gt; (hentet ${dd}.${mm}.${yyyy}).`,