Globalization micro-service design

I am looking to architect a Globalization MicroService [i18n + l10n] for a SAAS based product. The Micro-Service would be called both by JavaScript Front End applications [Front End Developed in AngularJS(1.5,2.X, 4.X), ReactJS] as well as Other Micro Services Developed in Java, C#. This is a multi-tenant system.

One important thing, the end user for a particular tenant can change the translation values at runtime. The same architecture needs to work both for on-prem as well as cloud solutions.

Let me know of any reference architecture