Bug 1094146

Fixed due to upstream: http://www.redmine.org/issues/17235
the patch doesnt work, the fix is imho slightly wrong:
the fix as in http://www.redmine.org/issues/17235 is:

flash[:error] = l(:notice_email_error, Redmine::CodesetUtil.replace_invalid_utf8(e.message.dup))

and not 

flash[:error] = l(:notice_email_error, Redmine::CodesetUtil.replace_invalid_utf8(e.message).dup)