How the German parties are marking #TagDerBefreiung on twitter: First off the CDU/CSU describing it neutrally as 75th anniversary of the end of the war and emphasizing a need to remember. 
The SPD describing May 8th as #TagDerBefreiung and declaring "Never again Fascism." Specifically mentioning Nazi tyranny and genocide.
Die Linke is using #TagDerBefreiung to thank the allies for liberating Germany from the Nazi dictatorship and calling on democrats to continue the fight.
The FDP also invoking #TagDerBefreiung and focussing on liberation from tyranny of Nazis who started a world war.
The Greens using the slogan "those who don't celebrate the 8th of May are the ones who lost." Importance of memory for demoracy. #TagDerBefreiung
And the AfD...well they are having a normal one.
