link to list of language codes instead of list of country codes

content/en/building/translations/managing-translations.md

@@ -20,7 +20,7 @@ Like the rest of the code the translation files live in the GitHub repo. These t
 
 New languages must be added and configured in several places:
 
-- Create a new `messages-xx.properties` file in the [`api/resources/translations`](https://github.com/medic/cht-core/tree/master/api/resources/translations) folder, replacing "xx" with the 2 or 3 letter [language code](https://en.wikipedia.org/wiki/List_of_ISO_3166_country_codes).
+- Create a new `messages-xx.properties` file in the [`api/resources/translations`](https://github.com/medic/cht-core/tree/master/api/resources/translations) folder, replacing "xx" with the 2 or 3 letter [language code](https://en.wikipedia.org/wiki/List_of_ISO_639_language_codes).
 - Add the language to the [`LOCAL_NAME_MAP` in api](https://github.com/medic/cht-core/blob/e6d184946affc62773d569168216a5b913f38a30/api/src/translations.js#L17). Use the language code for the key, and the local name followed by the English name for the language in brackets, eg: "fr: 'Français (French)'".
 - Import the moment language pack in the [main.ts file](https://github.com/medic/cht-core/blob/e6d184946affc62773d569168216a5b913f38a30/webapp/src/ts/main.ts#L23). If moment doesn't provide the required language pack you may need to contribute it upstream to the moment library.