In what language? Belgium has 3 official languages: Dutch (spoken by 60% of the population, living in Flanders region), French (spoken by 40% of the population, living in the Walloon region) and German (only small part in the east). Brussels capital area is bi-lingual French-Dutch.
But just use bravo, it's the same in all these languages ;-)
I think bravo is an international word. If you mean saying bravo when you applause is the same thing: Браво - Bravo. In Russian sometimes we say: Браво Бис - Bravo, Beas! where Bravo means that you liked the scene and Beas is that you would like to hear it again.
You just say 'Wonderful'.
You can say "bravo"
"Bravo" is actually more common in French than in English.
bravo
we say "excellent"
wonderful
wonderful
Bravo, piccola principessa -Source: Google Translator
Belgium = Belgien;
wonderful - mirabilis
They Say It's Wonderful was created in 1946.