That's the point. It doesn't work in the regular interface folder for some reason.
But it does work
to some extent in the data/language/interface folder that also contains the cinematics. (And thats where my worries of getting banned come from heh, hope that it won't happen)
Basically it shows the new icons on the unitframes like pitbull and aloft, but does not change the actual big icons above your head if you mark yourself with one of the icons.
Sadly.
BTW thank you, I tried keeping the original structure but modifying them to look a little more beautiful and not so ugly like the original ones.