convert: less shouting in SVN sink warning

hgext/convert/subversion.py

@@ -1157,5 +1157,5 b' class svn_sink(converter_sink, commandli'
             os.unlink(messagefile)
 
     def puttags(self, tags):
-        self.ui.warn(_('XXX TAGS NOT IMPLEMENTED YET\n'))
+        self.ui.warn(_('writing Subversion tags is not yet implemented\n'))
         return None, None