I don't know whether we have such an expression in Romanian, but, undoubtedly, it will be (or maybe it already is and I'm not aware) "Româna e limba lui Eminescu" (Romanian is Eminescu's language). Mihai Eminescu was a late Romantic poet, and he's considered the greatest Romanian poet of all times. His contributions to the Romanian language are priceless.
"Somnoroase păsărele" (Sleepy little birds) is a poem we learn at 8:
Sleepy little birds to drowse
Toward their nests guide their flight,
Hide themselves amidst the boughs-
So, good night!
But the springs sigh o'er their doom
While their noise the black woods cease:
Sleep wins e'en the garden's bloom,-
Sleep in peace!
The swans cleave the waves and ply
Toward the reeds and retreat-
Let angels be with thee, nigh,
Thy rest, sweet!
Over the night's faëry
The bright moon rides on the height;
All's but dream and harmony,
So, good night!
(translated by Dimitrie Cuclin)