feat: All Pylons tokens should instead display as USD

[AhsanRns]

Description

Closes: #XXXX

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[MikeSofaer]

Shouldn't there be an i18n file involved here?

Also as I said in Discord, please output "free" when the currency value is 0 instead of "0 xxxxx"

[AhsanRns]

no i18 file has no involvement

these variable are mostly from the constants defined in the app

i will update PR for "free" text

[AhsanRns]

PR update for free text

[kjawadDeveloper2]

Approving provided that mentioned changes are fixed.