Add detectLanguage.md

snippets/detectLanguage.md

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+---
+title: detectLanguage
+tags: browser,intermediate
+---
+
+Detects what the language of the current user is.
+
+- Retrieve the current language by looking in several places of the navigator object.
+
+```js
+const detectLanguage = () => {
+  if (navigator.languages && navigator.languages.length) {
+      return navigator.languages[0];
+    } else {
+      return navigator.userLanguage || navigator.language || navigator.browserLanguage || 'en-US';
+    }
+};
+```
+
+```js
+detectLanguage(); // "nl-NL"
+```