>the problem seems to be a missing Build-Depends on python-babel. I don't think that localization can magically work without translation files. In Gentoo we have:
$ equery f trac | grep /locale/ /usr/lib64/python2.7/site-packages/trac/locale/ca /usr/lib64/python2.7/site-packages/trac/locale/ca/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/ca/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/cs /usr/lib64/python2.7/site-packages/trac/locale/cs/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/cs/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/de /usr/lib64/python2.7/site-packages/trac/locale/de/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/de/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/en_GB /usr/lib64/python2.7/site-packages/trac/locale/en_GB/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/en_GB/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/en_US /usr/lib64/python2.7/site-packages/trac/locale/en_US/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/en_US/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/eo /usr/lib64/python2.7/site-packages/trac/locale/eo/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/eo/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/es /usr/lib64/python2.7/site-packages/trac/locale/es/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/es/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/es_AR /usr/lib64/python2.7/site-packages/trac/locale/es_AR/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/es_AR/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/fi /usr/lib64/python2.7/site-packages/trac/locale/fi/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/fi/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/fr /usr/lib64/python2.7/site-packages/trac/locale/fr/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/fr/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/gl /usr/lib64/python2.7/site-packages/trac/locale/gl/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/gl/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/he /usr/lib64/python2.7/site-packages/trac/locale/he/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/he/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/hu /usr/lib64/python2.7/site-packages/trac/locale/hu/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/hu/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/hy /usr/lib64/python2.7/site-packages/trac/locale/hy/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/hy/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/it /usr/lib64/python2.7/site-packages/trac/locale/it/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/it/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/ja /usr/lib64/python2.7/site-packages/trac/locale/ja/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/ja/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/ko /usr/lib64/python2.7/site-packages/trac/locale/ko/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/ko/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/nb /usr/lib64/python2.7/site-packages/trac/locale/nb/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/nb/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/nl /usr/lib64/python2.7/site-packages/trac/locale/nl/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/nl/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/pl /usr/lib64/python2.7/site-packages/trac/locale/pl/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/pl/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/pt /usr/lib64/python2.7/site-packages/trac/locale/pt/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/pt/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/pt_BR /usr/lib64/python2.7/site-packages/trac/locale/pt_BR/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/pt_BR/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/ro /usr/lib64/python2.7/site-packages/trac/locale/ro/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/ro/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/ru /usr/lib64/python2.7/site-packages/trac/locale/ru/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/ru/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/sl /usr/lib64/python2.7/site-packages/trac/locale/sl/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/sl/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/sv /usr/lib64/python2.7/site-packages/trac/locale/sv/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/sv/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/tr /usr/lib64/python2.7/site-packages/trac/locale/tr/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/tr/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/zh_CN /usr/lib64/python2.7/site-packages/trac/locale/zh_CN/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/zh_CN/LC_MESSAGES/messages.mo /usr/lib64/python2.7/site-packages/trac/locale/zh_TW /usr/lib64/python2.7/site-packages/trac/locale/zh_TW/LC_MESSAGES /usr/lib64/python2.7/site-packages/trac/locale/zh_TW/LC_MESSAGES/messages.mo In Debian, the following command returns no lines: $ dpkg -L trac | grep /locale/ -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". 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