Setting UI Language to "Auto Detection" will result in an English UI when the system language is Simplified Chinese

[gexgd0419]

Sandboxie-Plus will have an English UI in a Simplified Chinese system when Sandboxie's language setting is "Auto Detection".

After doing some research, I found that QLocale::system().name() returns "zh_CN" in my system, but the corresponding translation file is named sandman_zh-CN, so Sandboxie's language will fall back to English.

The translation files from the Qt installation have names like linguist_zh_CN.qm, suggesting that Qt separates the parts of locale names with underscores. Qt's documentation about QLocale::QLocale also tells you that.

Microsoft's documentation about locale names tells a different story, though. They separate those parts with hyphens, so "zh-CN" would be correct. However, passing "zh_CN" to the function LocaleNameToLCID still gives you the correct result.

Also here's some code from SandMan.cpp (line 2269):

QString LangAux = Lang; // Short version as fallback
LangAux.truncate(LangAux.lastIndexOf('_'));

Only when underscores are used to separate locale name parts will that fallback mechanism make sense.

[DavidXanatos]

now it loks like this:

	QString Lang = theConf->GetString("Options/UiLanguage");
	if(Lang.isEmpty())
		Lang = QLocale::system().name();
	Lang.replace("_", "-");

	if (!Lang.isEmpty())
	{
		m_LanguageId = LocaleNameToLCID(Lang.toStdWString().c_str(), 0);

		QString LangAux = Lang; // Short version as fallback
		LangAux.truncate(LangAux.lastIndexOf('-'));

that should take care of teh issue