Update bib.liquid

Fixed typo

Author: massimolipari

_layouts/bib.liquid

@@ -158,7 +158,7 @@
       {% capture entrytype %}{% endcapture %}
     {% endif %}
     {% if entry.month %}
-      {% capture entrymonth %}{{ " " }}{{ {{ site.data[site.active_lang].strings.months.long[entry.month] }} }}{% endcapture %}
+      {% capture entrymonth %}{{ " " }}{{ {{ site.data[site.active_lang].strings.months.long[entry.month] }}{% endcapture %}
     {% endif %}
     {% if entry.year %}
       {% capture entryyear %}{{ " " }}{{ entry.year }}{% endcapture %}