Umlaut characters in JIRA User Full Name breaks build trigger from JIRA

2016-01-04 17:32:30,069 WARN [http-bio-8085-exec-6] [AuthenticatorImpl] Problem encountered authenticating OAuth client for url "http://localhost:8085/bamboo/rest/api/latest/queue/TP-BP.json", error was "signature_invalid", with parameters "{oauth_problem=signature_invalid, oauth_signature=EMrhELQ12QEVj+B7YqI3wWKQR0eZ7Ud+hTC2sSb8JIBmG17paSJG5C/zvriPOM08nSegYFV0Llj3MvSO6OwhN9ufrTeJzXmb3Iyr8yvOPgajGt3fo1Pqy9OalJoK0+hSRyn2bmisCUa33T7zX2RfIbzaqnm25cOGWBsbGQmLHtk=, oauth_signature_base_string=POST&http%3A%2F%2Flocalhost%3A8085%2Fbamboo%2Frest%2Fapi%2Flatest%2Fqueue%2FTP-BP.json&bamboo.customPlanTriggerKey%3Dcom.atlassian.bamboo.plugin.jira%253AjiraReleasePlanTrigger%26bamboo.customTriggerReasonKey%3Dcom.atlassian.bamboo.plugin.jira%253AjiraReleaseTriggerReason%26bamboo.triggerReason.jiraBaseUrl%3Dhttp%253A%252F%252Flocalhost%253A8080%252Fjira%26bamboo.triggerReason.jiraProjectKey%3DPRA%26bamboo.triggerReason.jiraProjectName%3DPROJECT%2520A%26bamboo.triggerReason.jiraUserDisplayName%3DL%25EF%25BF%25BDnge%26bamboo.triggerReason.jiraUsername%3Dadmin%26bamboo.triggerReason.jiraVersion%3D4.1%26bamboo.triggerReason.jiraVersionId%3D10003%26oauth_consumer_key%3Djira%253A291ebdb7-1380-4278-98b6-822ca5097c79%26oauth_nonce%3D12164108535489%26oauth_signature_method%3DRSA-SHA1%26oauth_timestamp%3D1451899950%26oauth_token%3D16kBrLuoNLWmM6F2fopoG4h6frbGYccQ%26oauth_version%3D1.0, oauth_signature_method=RSA-SHA1}"