I tweaked the translation. Kotodoma is as you say the belief of "spirit/power residing in the words", so I guess "chant of truth" is a good option, or maybe "mantra of truth" if you stretch it a bit. I think Old Cid sounds more natural but others should judge.
As for the exclamations some were actually correct, beware as sometimes the JP tracklists aren't 100% accurate, it's fixed now.
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