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The user preference is used when you login through SSO (Single Sign On), so if you login directly through DATABASICS Login page then you would need to select the language and if you do not select it he the default it will be English. Once Once you select the language on login, the browser will set the login as that language going forward.
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If you login through SSO then the system will check your language user preference on login and set the language to for the site.
