Index: trac/ticket/api.py
===================================================================
--- trac/ticket/api.py  (revision 4458)
+++ trac/ticket/api.py  (working copy)
@@ -24,7 +24,7 @@
 from trac.util.html import html
 from trac.util.text import shorten_line
 from trac.util.datefmt import utc
-from trac.wiki import IWikiSyntaxProvider, Formatter
+from trac.wiki import IWikiSyntaxProvider, Formatter, Context


 class ITicketChangeListener(Interface):
@@ -160,13 +160,14 @@
     def get_custom_fields(self):
         fields = []
         config = self.config['ticket-custom']
+        c = Context(self.env, None)
         for name in [option for option, value in config.options()
                      if '.' not in option]:
             field = {
                 'name': name,
                 'type': config.get(name),
                 'order': config.getint(name + '.order', 0),
-                'label': config.get(name + '.label') or name.capitalize(),
+                'label': c.wiki_to_oneliner(config.get(name + '.label') or name.capitalize()),
                 'value': config.get(name + '.value', '')
             }
             if field['type'] == 'select' or field['type'] == 'radio':