You should not change anything in the Setting Editor yourself, this is advanced tool for developers only. Anyway, from the langauge manager, click the tab "Prepare" then click on the button Prepare langauges then after that set the default langauge from the Default tab in the langauge manager, then go to the theme manager and assign languages to themes. In your browser, you need to delete your browser cookies and cash also and reset your setting from the user side. Thanks
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