aasiriyar dhina nalvaalthukal
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."
Intha Naal meendum meendum Ungalathu vaalkkaiyil Uthikka enathu Nal Vaazththukkal.
To say "happy journey" in Malayalam, you can say "സുഖമായ പ്രയാണം" (sukhamaya prayanam).
You can say "இனிப்புறம் வாழ்த்துக்கள்" (Iniya pirandha naal vaazhthukkal) in Tamil, which translates to "Happy wedding".
Fuku tamina is happy wedding in Tamil, hope this helps you :).
You can say "സുഖാലി അധ്യാപക ദിനാശംസകൾ" (sukhali adhyapaka dinashamsakal) in Malayalam to wish someone Happy Teachers' Day.
행복 한 교사 하루 = happy teachers day
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.
Santhosamaaga Iru
Intha Naal meendum meendum Ungalathu vaalkkaiyil Uthikka enathu Nal Vaazththukkal.
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
You say it in English, just as you would do in the US or any other English speaking country.