JSP default encoding
if not specified the portail JSP default encoding is not UTF-8 and one must add the following directive at line 0:
<jsp:directive.page contentType="text/html;charset=UTF-8" />
Solution
- document the JSP directive in manuals
- find out if there is a default encoding parameter
(from redmine: issue id 2895, created on 2020/09/18 by Matthieu Decorde)