In the key of C, the chords are C and G. (Play the C chord all the way through until you get to "I" and then play the G chord on "wish."

Line 1: Verse
Line 2: Chord on 2nd & 4th beat

         Today is | Mon-day - Today is | (continue)
C - C -       | C       C          | (repeat same chords)

All you German | mothers, - I | wish the same to | you.
C   -   C -   | C       C - | G    -   G    - | C

Because of the difference between the font in the text entering form and the font that is displayed on the web page, I can't make the chords line up with the words, so I hope this makes sense. The "|" character indicates the end of each 4 beat phrase. (If you copy it to a plain font, it should be lined up.)