The last (and only) game where it was present had been Forza Motorsport 4 made for Xbox 360 system. Since then it went missing and never returned as playable car in this franchise.
If you want to drive it in Forza you need to go to that game (which is not the easiest task to do).
Eventually, your other option is purchasing this car (made between 2005 and 2014) in real life. Given the fact you are writing in German language I would recommend you starting with AutoScout24 or Mobile.de
Hope you find my answer at least remotly helpful. If it sounds rude or harsh in any way I am sorry.
kinda shame that this is mostly due the fact Forza fans for some reason seems to care only to exotic cars, go see the most voted list and you will see that on Top 10 like 6 or 7 cars are some variation of exotic car and the only that can be considered daily driver is the Nissan Tsuru but is there mostly due the Horizon Mexico memes
I hope that T10 look at Motorsport 4 and see how much great daily drivers the game had and look on the tracks around the world where most of local grass roots racing are made with modified daily drive cars
There is no reason why they shouldnt bring it back
its popular on europe, there is auto racing series with this car and it could be agreat start car if we cant get the Toyota Aqua