fix: replace hardcoded 'html' as template directory Template directory is now determined by loading the config file from the tracker home and using the template setting. Also fixed error message when polib import fails to indicate extraction is only from thml templates.

from roundup.dist.command.build import build_message_files, check_manifest
from setuptools.command.install_lib import install_lib as base

class install_lib(base):

    def run(self):
        check_manifest()
        build_message_files(self)
        base.run(self)