Updates execution/localization.md

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execution/localization.md

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+# Localization
+
+## Language Variants
+If a resource has multiple language variants and the difference between variantsis only in the language of human readable fields then the [`Accept-Language`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Language) request HTTP header **SHOULD** be used to communicate the desired language variant.
+
+#### Example
+
+```
+GET /article HTTP/1.1
+Accept-Language: en,en-US,fr;q=0.6
+```
+
+```
+HTTP/1.1 200 OK
+Content-Type: application/hal+json;charset=UTF-8 
+Content-Language: en
+Vary: Accept-Language
+
+...
+```
+
+## Language or Country-specific Data Structure