feat: support of custom currencies display on various sheets

LeCuayrequested to merge
lecuay-fvtt/forks/fork-foundryvtt-pathfinder1:4612-currency-display-i18n-strings-need-to-be-made-more-flexible into master

Summary

Implements #4612.

TODOs & Open Discussions

  • Due to Vehicle sheet being buggy I was only able to test outcome via debugger. It was correct as far as I can tell.

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