Everything is said in the error message. Open your translation file and fix "date:format" there to have a real date-format instead of "format" "format" isn't a valid date-format. Even example is provided in the message.
Everything is said in the error message. Open your translation file and fix "date:format" there to have a real date-format instead of "format" "format" isn't a valid date-format. Even example is provided in the message.