Terra-core: [terra-i18n-plugin] Deprecate on NPM

[yuderekyu]

Feature Request

We list this package as deprecated on the readme, but it's not deprecated on the NPM registry.

[emilyrohrbough]

Yesterday I was reading someone's console output that was using terra-i18n-plugin and we should do one last release to update the deprecated message that is output. It currently says use terra-i18n aggregate-translations tool instead of terra-toolkit's aggregate translations tool

[ryanthemanuel]

@emilyrohrbough I'm not sure how possible it is to do another release of the tool since it doesn't exist anymore. I'm going to deprecate the package though.

[ryanthemanuel]

Deprecated: