"Dovaogēdy kēla jorrāelza."

Translation: The Unsullied loves the cats.

[evan.manning]

This doesn't make sense to me, i thought [a] was singular and [i] was plural...

[Joel__W]

It's a different declension and thus has different endings. See http://wiki.dothraki.org/High_Valyrian_Noun_Declensions#Lunar-type:_br.C5.8Dzi