View.Language Property (Outlook)
Returns or sets a String value that represents the language setting for the object that defines the language used in the menu. Read/write.
The Language property uses a String to represent an ISO language tag. For example, the string "EN-US" represents the ISO code for "United States - English."
If a valid language code is specified, the object will only be available in the View menu for the specified language type. If no value is specified, the object item is available for all language types. The default value for this property is an empty string.