Edit: the above image is my new favourite. Thanks Gary!
Bonne anniversaire! Do at least one fun thing.
“..Happy Birthday to You..”
Slan,
D.
Happy birthday!!
Happy Birfday
Celebrate inebriately immediately. 
and many, many, more…
Happy Birthday! I’ll eat a cake in your honor today. 
Susan
Congrats!
June 15th? Mine is June 16th.
We are almost twins.
Mukade
Happy Birthday!
A very happy birthday to you Beth!
We need a cake!
Enjoy the day!
MarkB
Happy Birthday!
Dale
Feliz!, Skol and many happy returns!
Happy Birthday Beth. Today is mine too. I’m mumblemumble years old.
¡Feliz Cumpleaños!
Happy Birthday!
Happy Birthday Beth and Happy Birthday to you too John!!!
Cheers,
Kathy 
Breithlá sona duit, a chara! Go maire tú an lá!
Redwolf
Happy birthday Beth and John.