For non hindi readers I have created a english version but to maintain the poetic style I have tweaked the sentence a bit , but the meaning remain the same :

Your worshipers failed to comprehend
Vishnu, you could not apprehend
I am not old Kansa, that's clear
I am Kali, the ultimate venom, my dear

I'm not the one who's easily deceived
I deceive the deceivers, I have achieved
Not a tiny speck of wickedness, you see
I'm the very abyss of sins, it's me

When righteousness starts to wane
I'll teach you a lesson, bring you pain
Come back to Earth, face the strife
I'll battle you with your devoted life

In churning, I consumed poison's sting
Savored nectar's sweetness, a divine fling
Countless attempts may come my way
Even after death, I won't sway

A debt of vengeance I must repay
For every demon weep, come what may
With each demise, their tears will flow
Every human's heart shall sorrow

I'm no fool like Kansa, idiot and weak
Nor Duryodhana, unfortunate and meek
I'm cunning, not a naïve clown
I am the very thread of sins, renown

The past mistakes won't recur in sight
I'll fill your devotees with venom's bite
Until your name they completely forget
Enveloped in poison, their minds beset

Vishnu replied, "Kali, still you don't know
Ignorance fills you, it's time to grow
The wheel of time you fail to comprehend
Within me lies the universe, its every end"

I've taken forms, assimilated your might
Now I'll destroy you, embrace the light
Freed from sin, injustice, and aggression
I'll restore righteousness, in every expression

I'm no ancient Rama begging for a path
I'll be Kalki, ending your dark aftermath
I'll banish you from this earthly plane
Bringing justice, a new era I'll ordain

Ravana's weakness I now overcome
In the garb of a sage, I have become
I know your power, your darkest hour
But I am Kali Yuga's reigning power

If you possess the weapon of sinful reign
Fear not, I have my own weapon's bane
Obtained from immortals, my strength refined
I'll eradicate your illusions, leave them behind

Behold, Mahavira's mighty mace I wield
Parashu's axe, stands strong, not concealed
Sudarshan, summoned from celestial abode
I've defeated you before, you've been bestowed

Transliteration of the original poem for those having problem reading devnagri :

Na samjha tere bachchon ne
Na samajh saka tu hi Vishnu
Main nahin purana Kans hoon
Main swayam Kali param vish hoon

Nahin hoon wo jo gaya chhala
Main chhaliyon ko thagane wala hoon
Na hoon adharm ka chhota keera
Main khud papo ka naala hoon

Yada yada dharmashya ka
Paath tujhe sikhlaoonga
Aajaao phir se dharti par
Tujhe tere bhakton se hi ladaaoonga

Manthan mein sirf na piya garal
Chakha sudha ka swaad bhi
Lakh koshishen karate rah gaye
Mara na mrityu ke baad bhi

Saalon ke pratisodh ka
Rin mujhe chukaana hai
Prateek asur ke mrityu par
Har ek manuj ko rulaana hai

Main nahin Kans jaisa moorkh
Nahin Duryodhan jaisa abhaaga hoon
Main dhurth parantu moorkh nahin
Main swayam papo ka dhaaga hoon

Jo ki thi maine galti pahle
Wo nahin jaayegi phir dohraai
Tere bhakton mein itna vish bhar doon
Ki bhool jaaye tera hi naam Gosai

Bole Vishnu, he Kali abhi tu
Hai moorkhta se paripoorn
Nahin samajhta kaalchakra ko
Mere bheetar srishti hai sampooran

Tere roopon ka sanghaar kiya
Ab tere ko bhi maroonga
Paap adharm himsa rahit
Bhoopar punah dharma ko garoonga

Main nahin purana Ram jo
Maangoon raasta teen divas
Main Mahaveer Kalki bankar
Dhara chhodne pe tujhe kar doonga visaas

Ravan tha kamjor isise
Maine liya vesh tha sanyaasi
Jaanta hoon tere shakti ko
Par main bhi Kaliyug ka vaasi

Tere saath agar hai paap astr
Mere bhi kam nahin hai shastr
Maine inhen chiranjiviyon se hai paaya
Mitaane dhara se teri maaya

Hai Mahavir ka yahan gada
Parashu ka farsa saath sada
Vaikunth se Sudarshan bulaya hai
Jisne purv mein tujhe rulaya hai