You say, "Me alegro de oir eso." 'Oirlo' [literally 'hear it'] is more likely to be said than 'oir eso' [literally, 'hear that.']
You can say, "I'm happy to help!" or "I'm glad to assist you!" Both phrases convey a positive willingness to provide support or assistance.
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
Me gusta decirle ...
Felices Fiestas
Estoy Contento