You asked for a translation of the German text:
  "Treue liebe machtuns gluecklich  o, lie welke nie!"

I would correct the text a little bit:
  "Treue Liebe macht uns gluecklich - O, Liebe welke nie!"

My translation - maybe it should be more romantic:
  "Faithfulness love makes us lucky - o, love never wilt!"

Greetings from Hauke Marxsen (Germany)

 [ My wife seldom calls me 'romantic' ;) , but I offer:
 [
 [ "True love makes us lucky-o, love never ages!"
 [
 [ I wonder if that's the first line of an old poem
 [ from one of the German-speaking lands...
 [
 [ When my mother was in college in the mid-'20s she enjoyed
 [ riding in her girlfriend's Model T Ford, which was named
 [ "True Love" because it never ran smooth !  -- Robbie