update bilingual

lib/views/admin/security.html

@@ -1,6 +1,6 @@
 {% extends '../layout/admin.html' %}
 
-{% block html_title %}セキュリティ · {% endblock %}
+{% block html_title %}{{ t('Security settings') }} · {% endblock %}
 
 {% block content_head %}
 <div class="header-wrap">