Swastika = I hope you know what the swastika is when you see it.

Der Fuhrer = "The Leader." Hitler's title during his reign was the Fuhrer. No big secret there.

Sieg Heil = Hail Victory. When you see someone doing the Nazi salute, this is usually what they'll call out zealously.

SS = I hope you know what the SS runes look like, and what it is. If not, the SS, or "Schutzstaffel" (Protection Squadron) was Hitler's personal protection units. The Waffen-SS (Weapon-was the most common, being the standard infantry of the SS. The Allgemeine was less combat oriented, and was instead more of a ceremonial unit-- And the pencil-pushers of the Nazi regime.

Ich Liebe Dich = Somewhat out of place amongst everything else, "I love you." So... Either someone baked a cake in dedication to Hitler, or a pair of Neo-Nazis are in love.

18 = We're getting into Neo-Nazi symbolism now. Count one letter into the alphabet. Then count eight letters in. You'll soon discover you just got A and H. Whose initials are those? Adolf Hitler.

1945 - The year World War II ended. Also the year that Hitler shot himself.

88 = As before, count into the alphabet. H and H. But... Those aren't initials! No, it's an abbreviation. Heil Hitler.

Long story short, it's a Hitler shrine.