Django 設置 LANGUAGE_CODE = 'zh-Hans' 報錯

Django框架開發項目時，在settings.py中設置 中文 語言時報錯： LANGUAGE_CODE = 'zh-Hans' 報錯：ERRORS: ?: (translation.E004) You have provided a value for the LANGUAGE_CODE setting that is not in the LANGUAGES setting.   處理辦法，

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