fix: use `Currency` in the metadata description

[mvadari]

High Level Overview of Change

This PR adds the use of the Currency element to the metadata processing, so that proper hex-converted currency codes are used and there are links to the currency pages.

Context of Change

It is difficult to read when currencies that have a code longer than 3 characters aren't displayed properly.

Type of Change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Refactor (non-breaking change that only restructures code)
• [ ] Tests (You added tests for code that already exists, or your new feature included in this PR)
• [ ] Documentation Updates
• [ ] Translation Updates
• [ ] Release

TypeScript/Hooks Update

• [ ] Updated files to React Hooks
• [ ] Updated files to TypeScript

Before / After

Before:

After:

Test Plan

TODO

[pdp2121]

Is it for https://github.com/ripple/explorer/issues/925?

[mvadari]

Is it for #925?

Yes, I forgot there was an issue.