it's never named specifically, but the characters have been through it and so it's safe to assume that some of them at least suffer from it (there's quite a few symptoms mentioned like having trouble with sleeping and stuff, so trauma is definitely discussed, it's just hard to say if it's PTSD exactly or if we'd today label it differently)
pretty much everyone in this show is mentally ill and some of them are eventually violent or have been violent (it's a war), but there's no trope of villifying a mentally ill person by making them violent, and no one's violence is connected to their mental illness implicitly or explicitly
there are several scenes of alcohol intake (in celebration and due to stress), but no one is an alcoholic and alcohol abuse isn't a part of anyone's character
there's no scene in which a character willingly chooses to die for another or for a cause and then does, though many of the characters are prepared to do so
Shes pressured to sleep with him to help other people and feels disgusting afterward. He doesnt know she doesnt want to. He trys again later, she says no and he gets angry and leaves.
Its not a finger but a knife goes through someones hand in the beginning of the second episode with a lot of blood. Its quick black and white scene. It is mentioned again later in the episode but you can skip it and it wont alter the episode because they say what happens in that conversation.
I'm very sensitive to sounds and nothing in this show triggered me, but regardless there's a few instances of gun shot sounds, sirens, screaming and similar, so I'd avoid it if you have trouble with sounds like that (it's a show about WW2, so a lot of it is expected)
In episode 2 a character (who is a historical figure who really died this way) kills himself by overdose under the mistaken belief that he is going to be captured by the fascists. His actual suicide is not shown on screen but his dead body is shown and the means of death is implied
In the first episode, an old man jumps from a boat to avoid French police. He's wearing a heavy coat and doesn't resurface. Albert jumps in after him and goes under several times looking for him but doesn't find him. You don't see him drown on screen, you just see him go under and disappear