Feature Request: Internationalization request on UI

**Is your feature request related to a problem? Please describe.**

As a local content manager like the persona ["local restaurant owner"](https://aws.amazon.com/blogs/aws/aws-amplify-admin-ui-helps-you-develop-app-backends-no-cloud-experience-required/), I want to use AdminUI in different language so that I can deliver content to production without mistakes.

**Describe the solution you'd like**

Integrating language options and internationalization would be unblocker to the situation. Currently, Admin UI doesn't seem to have the language select on footer that the other AWS management console pages have. I'm sharing the below screenshot as an idea where we can put the select input.


**Additional context**

I heard from developers who works at Web design agency in Japan that Admin UI seems to fit for needs that CMS covers and I heard. At the same time, people say that they cannot use Admin UI for their client works yet because lack of the language supports. In fact, some of web site agencies in Japan uses microCMS(see also [https://microcms.io/](https://microcms.io/)) that supports Japanese.

Hope this helps service improvement :)

The issue names no files, tests, or entry points. Start by locating the Admin UI footer and reviewing the language-selector pattern referenced from other AWS management console pages; done means providing language options and internationalization so local content managers can use Admin UI in different languages.

Written by the indexing model from the issue text.