I had a proprietary, home made, internationalization support built into the plugins, to help me keep a single code base for Trac 0.11 and 0.12.
But I wanted to switch to the Babel-based, standard Trac 0.12 implementation. I now found the time to do it, and here it is! …with Italian as a second language :-)
Release 1.3.12 (2010-12-19):
o Enhancement #8321 (Track-Hacks): Add standard internationalization support (i18n)
o Enhancement #8322 (Track-Hacks): Show timestamps according to User's locale
o Fixed Ticket #8323 (Track-Hacks): Unable to expand Available plans and Test case status change history collapsable sections