diff --git a/templates/partials/fullcalendar.html.twig b/templates/partials/fullcalendar.html.twig
index 88e4fda1..a6e411a8 100644
--- a/templates/partials/fullcalendar.html.twig
+++ b/templates/partials/fullcalendar.html.twig
@@ -7,10 +7,6 @@
 <div id='cfgFilestring' style='display:none;'>{{ icsfile }}</div>
 <div id='BgColstring' style='display:none;'>{{ config.plugins.fullcalendar.colors }}</div>
 <div id='CorsUrl' style='display:none;'>{{ config.plugins.fullcalendar.cors_api_url }}</div>
-{% if config.site.default_lang %}   {#  use site default lang, if set, else 1st supported lang from system config #}
-    <div id='cfgLocale' style='display:none;'>{{ config.site.default_lang }}</div>
-{% else %}
-    <div id='cfgLocale' style='display:none;'>{{ config.system.languages.supported[0] }}</div>
-{% endif %}
+<div id='cfgLocale' style='display:none;'>{{ grav.language.getLanguage }}</div>
 <div id='showlegend' style='display:none;'>{{ config.plugins.fullcalendar.showlegend }}</div>
 <div id='tzoffset' style='display:none;'>{{ config.plugins.fullcalendar.tz_offset }}</div>