santhoshakaramaya dampathya geevitham
happy married life = glückliches Eheleben
You can say "Pongal Vazhthukkal" in Tamil to wish someone a happy Pongal.
You can say "நான் மகிழ்ச்சியில் உள்ளேன்" in Tamil, which translates to "I am happy."
"Eniya deepavali nalvaalthukkal" is happy Diwali in Tamil.
Fuku tamina is happy wedding in Tamil, hope this helps you :).
Santhosamaaga Iru
sukhi bibahito jibon
un mariage heureux
Navaraathiri Nalvaazhthukkal
To say "happy journey" in Malayalam, you can say "സുഖമായ പ്രയാണം" (sukhamaya prayanam).
Putthaandu Vaazhthukkal - is Happy New Year in Tamilஇனிய தமிழ் புத்தாண்டு நல்வாழ்த்துக்கள்