QT_I18N_SOURCE_LANGUAGE
指定可翻译字符串的语言。
该变量自 Qt 6.7 起引入。
指定源代码中可翻译字符串的语言。该语言必须与基于字符串的QLocale 构造函数兼容。
该变量与QT_I18N_TRANSLATED_LANGUAGES 配合使用，用于确定qt_add_translations()所用.ts 文件的名称。
可以通过qt_standard_project_setup()命令方便地设置此变量。
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