'Flutter 应用里的国际化' page issue

[zhonghanwen]

Page URL: https://flutter.cn/docs/development/accessibility-and-localization/internationalization.html
Page source: https://github.com/cfug/flutter.cn/tree/master/src/docs/development/accessibility-and-localization/internationalization.md

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Description of issue:
乱码

[chenglu]

OK, 我来处理一下。