According to Wookieepedia, the song was indeed Hindi.
The song played in the background in the pirate stronghold is a Hindi
song known as "Indian Pop Source", composed by the series' composer
Since Hondo Ohnaka's gang was a group of only Weequays (despite of a couple of Kowakian monkey-lizards) and the performance took place at their complex, I think it's safe to say Hindi acted out as Sriluurian, the native language of Weequays. Although there were some Jawas and Bith (who were well-known musicians) at the stronghold, and the performers was never shown in the episode, it's still presumable the song was sung in the audience's native tongue.