I can confirm this (I am also using latest Edgy, with en_CA locale). I fixed it simply by changing use_markup to True for the three labels in /usr/share/gnome-power-manager/gpm-prefs.glade... although I'm not sure why this would only happen in the en_CA locale.
-- <b></b> HTML tags in tab title in gnome-power-preferences https://launchpad.net/bugs/59114 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
