ADYABAKADINAASHAMSAKAL
You can say "സുഖാലി അധ്യാപക ദിനാശംസകൾ" (sukhali adhyapaka dinashamsakal) in Malayalam to wish someone Happy Teachers' Day.
In Malayalam, "happy" is said as "സന്തോഷം" (santhoshm).
To say Happy Sunday to all in Malayalam you say "Happy ahad kepada semua".
행복 한 교사 하루 = happy teachers day
Be happy=Santhoshamayittirik
Pithrdina Ashasmsakal. In malayalam, we will not use the exact meaning for happy. All Good Events are happy events. Instead of Happy we use the malayalam word for wishings, ie ashamsakal. Pithr means Father Dina means Day Ashamsakal means Wishes. Hope it is useful. Ashamsakalode (Best Wishes) Salih
You would say "ഞാൻ വെറുപ്പുണ്ട്" (njaan veruppundu) in Malayalam to mean "I am very happy."
To say "happy journey" in Malayalam, you can say "സുഖമായ പ്രയാണം" (sukhamaya prayanam).
You say it in English, just as you would do in the US or any other English speaking country.
In Tamil, you would say "இனிய ஆசிரியர் தின நல்வாழ்த்துக்கள்" (Iniya aciriyar dinna nalvazhthukkal) to wish someone a happy Teacher's Day.
You can say "ഇന്ന് ഒരു നല്ല ദിവസമാണ്" (innu oru nalla divasamana) to convey "it is a nice day" in Malayalam.
athu enne valare santhoshipikkunu
Sukhayathra!, Rasakaramaayirikkatte! (സുഖയാത്ര!, രസകരമായിരിയ്ക്കട്ടെ!)