[imp] Introduce jquery formvalidator for com_banners. Fixes #5041

Also Covers com_categories

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[imp] Introduce jquery formvalidator for com_contact. Fixes #5043

obvious mistake

Thanks @smanzi

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[imp] Introduce jquery formvalidator for com_content. Fixes #5044

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[imp] Introduce jquery formvalidator for com_finder. Fixes #5045