The song has lots of misspellings and grammar errors.  Here is a 
translation.


"The whole world --
All of heaven and earth --
The entirety of creation --
All of it is worth nothing.
Except one treasure that HaShem [God] created."
Said the Kotsker [Rebe, Menachem-Mendl].

If just one minyan [ten adult male Jews] would stand on the rooftop
And call forth loudly just one thing,
"HaShem is God, HaShem alone!",
[the following is in Hebrew, not Yiddish]
A Jew with a great voice, not ceasing
Crying to Me with love [ratsuf: a Hebrew word I don't recognize],
"Hear, Israel: HaShem is our God, HaShem alone!"

Raphael