Browse tracker plugins was localizable a few time ago, but it's no more true. May be because it has been rewriten with wxformbuilder in january 2018.
I see that, for example, in ConfigPanel.cpp each text is configured with wxT(). To be able to translate them, some of them should be set with _(). It was like that in the past, but it's no more the case.
I can make it work, but at the top of ConfigPanel.cpp, it is written "PLEASE DO *NOT* EDIT THIS FILE" : so, I suppose modifications will be lost with a future release.
gd_on