Minor config issues requiring system/ files modification

[Tom Zeller]

> Quick reply : I believe both those bugs are fixed in later code, which we  can make sure are included in some sort of release soon.

Noting that the two relevant issues are IDP-666 (UTF-8 messages,
planned for 3.1.2) and IDP-637 (AttributeDisplayDescriptionFunction,
planned for 3.2.0).

https://issues.shibboleth.net/jira/browse/IDP-666.

https://issues.shibboleth.net/jira/browse/IDP-637