Upgrade frontend-i18n to react-intl 3.x

Description

The react-intl library has a new maintainer (as of earlier this year) which has been doing a lot of cleanup and feature work. We're currently on v2.x, and upgrading to v3.x would give us some nice additions such as React hooks-based intl injection, and usage of intl outside of the context of react, which would be really helpful w/r/t making our code easier to reason.

Status

Epic Link

Story Points

None

Assignee

Unassigned

Reporter

David Joy

Labels

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