Use vue-i18n-bridge for migration.

[mshima]

• replaces $t which is reserved at vue 3 with t$.
• drop custom formatter. vue-i18n v9 doesn't support.
• create a transform to convert i18n files to v9 format.

Related to #12558.

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[mshima]

@DanielFran can we merge this?
Review can be done post merged too.
It changes almost every file blocking others PRs.