An ISO 3166-1 alpha-2 country code
The desired language, consisting of an ISO 639-1 language code and an ISO 3166-1 alpha-2 country code, joined by an underscore. For example: es_MX, meaning Spanish (Mexico). Provide this parameter if you want the results returned in a particular language (where available)
Note: If locale is not supplied, or if the specified language is not available, all strings will be returned in the Spotify default language (American English). The locale parameter, combined with the country parameter, may give odd results if not carefully matched. For example country=SE&locale=de_DE will return a list of items relevant to Sweden but as German language strings
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https://developer.spotify.com/documentation/web-api/reference/#endpoint-get-a-category