This reverts commit 3716524b.

Just change all imports and dependencies.

We still need to force the v3 format internally because i18next-scanner
doesn't support the new format and v4 drops support for Safari<13.

By setting compatibilityJSON things should continue to work as before.

No longer needs babel, but requries an alpha version of the typescript plugin
for eslint 8 support

Proof of concept for text display from a separate json file,
all array items of key 'hi' are printed to the browser console.

These are all transitive dependencies (or unused) so they get pulled in
anyway.