Update content/ember/v3/deprecate-ember-string-loc.md

Author: locks

content/ember/v3/deprecate-ember-string-loc.md

@@ -10,5 +10,5 @@ Ember provides a very basic localization method via the `@ember/string` package
 This feature was introduced a long time ago but is insufficient for most use cases.
 We suggest you replace it with an addon in the [Internationalization category](https://emberobserver.com/categories/internationalization) of Ember Observer.
 
-A popular addon that supports ICU message syntax and native browser Intl is [ember-intl](https://ember-intl.github.io/ember-intl/).
-Check the [documentation](https://ember-intl.github.io/ember-intl/docs) for more detailed information.
+A popular addon that supports [ICU (International Components for Unicode)](http://userguide.icu-project.org/formatparse/messages) message syntax and native browser Intl is [ember-intl](https://ember-intl.github.io/ember-intl/).
+Check the [documentation](https://ember-intl.github.io/ember-intl/docs) for more detailed information.