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* Server side validation for integer property value editor. * Apply suggestions from code review Co-authored-by: Mole <nikolajlauridsen@protonmail.ch> * Applied further changes from code review. * Localized validation messages. * Added server-side validation for decimal property editor. * Added server-side validation for slider property editor. * Moved repeated step validation into a helper method. * Add danish translations --------- Co-authored-by: Mole <nikolajlauridsen@protonmail.ch>