Updating ember-cli-typescript will help remove warnings that ember-intl (along with other addons) might have produced.

WARNING: ember-cli-typescript requires ember-cli-babel ^7.17.0, but you have version 8.0.0 installed; your TypeScript files may not be transpiled correctly

[!IMPORTANT] The blueprint files, which make ember g translation <locale> currently possible, will be removed in v7.0.0. You can manually create the translation file (more accurately).