I'd have thought that half a dozen effects would be enough, yes.
If you're concerned about there not being enough diplomatic bonuses in the game without Language as a civic, DH, it might be an idea to slightly increase the pre-existing bonuses to compensate.
If you're concerned about there not being enough diplomatic bonuses in the game without Language as a civic, DH, it might be an idea to slightly increase the pre-existing bonuses to compensate.