You say, "Me alegro de oir eso." 'Oirlo' [literally 'hear it'] is more likely to be said than 'oir eso' [literally, 'hear that.']
feliz
I'm happy too in Spanish is Estoy contento también.
Estamos contentos.
You mean "Happy Valentine's Day"?
Happy land in Spanish is tierra feliz. Happy land in Italian is terra felice. Happy land in French is terre heureuse.
Feliz Navidad!
Hora Feliz.
y feliz con
Felices Fiestas
Me gusta decirle ...
Estoy Contento
mujer feliz