This seems like an oversight to me. How is my Cleric supposed to read ancient tomes about various religions in old languages? Or bring their Religion to other cultures with a different language. It should, at the very least, have Tongues as Truespeech is a pretty common ability of most Good Outsiders.
Right now Channel Smite only works for melee strikes.
Could you possibly change it to a 2-3 action ability and allow the 3 action version to use a ranged strike? It's still the same action amount as doing a bow attack+ranged heal attack, but you get to tie them to the same hit and takes the saving throw out of the equation (still no more damage than the 2 action melee version though).
Just want to include Clerics of Erastil with the ability.