CMS doesn't handle document translation names with line ends well

If the hippo:message property of a document handle's hippo:translation subnode contains line ends (and perhaps other special characters), Wicket dialogs do not show and no errors are shown or logged as well.

Use case:

• an externally imported document has hippo:translation/@hippo:message with line ends
• the document can be opened but the publication options "Take offline" and "Schedule take offline" do not work