That means almost half.

As in “almost half of Germans are in favor of banning the AfD, according to a survey.” And this means, of course, that the majority of Germans are against banning the AfD.
Almost half of Germans in favor of banning the AfD, according to survey – 61% of Germans consider the AfD to be a right-wing extremist party. According to a representative survey, 48% want it to be banned.