[D&D5e] Change 5e System Names & Things?

Hello all, I was wondering if it was possible to edit existing names for things in the D&D 5e System for Foundry. Specifically, these are the changes I wanted to make. Simple, and mainly just for my own peace of mind if that makes sense:

- Spells' levels are called Tiers instead
- Change the term Spell to Arte wherever possible, like in the character sheet and compendium.
- Rename Cantrips to 0 Tier instead

Idk how simple it would be to code myself, or if its possible at all.