Can I get the $scope.topNavMenu in my plugin?

can I get the $scope.topNavMenu in my plugin?

Yeah, you should be able to get/set it from your plugin. Are you having trouble with this? You can take a look at how the timelion plugin accomplishes this:

i wanna make a i18n by hack it, is that possible?

Hmm, you definitely could accomplish this via a hack plugin by just getting the elements in the top nav and renaming them. But if the selectors ever changed you'd have to update your plugin.