Good discussion! :) "I LOVE YOU" in Persian is " دوستت دارم [ doostat daaram ] " The pronunciaion I wrote is the standard pronunciation. But the colloquial pronunciation is " دوست دارم [ dooset daaram ] " :)

To say "I love you" in Ukrainian is <em>"Я тебе кохаю" (Ya tebe kohAiu)</em>. You can say this to your romantic partner. Or <em>"Я люблю тебe" (Ya liubliu tebe)</em> - you can say that to everyone, including your family and friends. 
In Bulgarian - "<em>Обичам те" (Obicham te)</em>

In Spanish we say <em>Te quiero </em>or also <em>Te amo </em>(but this has a stronger meanning)

And in Catalan is <em>T'estimo</em>

In Turkish it is '' Seni Seviyorum''

in Russian it is "Я люблю тебя" - Ya l'ubl'u tebya. in Kazakh - Мен сені сүйемін [men seni sujemin]