The German inscription says:
Kindesdank folgt Euch in Eure Gruft
Ruhet sanft bis Euch der Heiland ruft.
Translated:
The thanks of your children will follow you into your crypt.
Rest gently until the Savior calls you.
And then there is a verse from the bible:
Wir wissen aber, daß denen, die Gott lieben, alle Dinge zum Besten dienen.
Römer 8, 28
And we know that in all things God works for the good of those who love him.
Romans 8:28