Finalized EntityTypeExtension with property for select2, updated the VulnerabilityType with empty_value and label values. CSS Fix to resize Select2 boxes to 360px width (refactored from Twig template). Updated translations to reflect new string methodology. Adjusted the form field themes for the choice to handle translations, requirement of field and empty_value property. Sanitized OwaspItem and Vulnerability views and added a content block to the base twig template.
Added css to center align the content div, added colors, borders etc. Integrated generic Twig template for edit view.
Implemented Vulnerability references mechanism with embedded forms; updated vulnerability controller with two new functions, created VulnRefCollectionType and VulnRefType (with hyperlink validation), CRUD for VulnRef. Implemented M2M mechanism based on Select2 tool for Product - Tools relationship and updated Twig template for new products accordingly. Various CSS fixes and small translation additions.