Binding для свойства "<var>Property Name</var>" не может использовать язык целевого элемента для преобразования. Если требуется культура, необходимо явно указать ConverterCulture для Binding.

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Binding for property '<var>Property Name</var>' cannot use the target element's Language for conversion; if a culture is required, ConverterCulture must be explicitly specified on the Binding.

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