Just to make things clear: it´s against the law to show pictures of Hitler in Germany when it´s not related to some scientific or historical work. There are still some groups in Germany that wish to revive the Nazi ideology and they are somewhat worshipping pictures of AH. I´m not commenting on whether it´s good or reasonable, it´s just a matter of fact that those pictures and names in games are not allowed in Germany.
Edit: Just tried to look up the law (§§11, 86, 86a StGB). It´s not explicitly forbidden to use pictures of AH, only pictures of flags, insignia, emblems, parts of uniforms, slogans, and forms of greeting that are related to Nazis. But there´s always a risk of being interpreted in the wrong way (e.g. "propaganda against liberal-democratic foundations") which could result in the ban of AoD from the German market.