[syslog-ng] Errorneous behaviour of syslog-ng v2.0.0 with logmessages in German

Hello, I use syslog-ng v2.0.0 and observe the following erroneous behaviour: If I specify a template for a target in syslog-ng.conf, a log-message, which contains letters specific to German language (Ä, ä, Ö, ö, Ü, ü), gets korrupted. Without specifying a template all works fine. The function in the source code, which corrupts log-messages is src/templates.c::log_template_format(...) Is this a bug? I appreciate each help.