Added missing CSS and JS for bootstrapdialog. From here: https://github.com/GedMarc/bootstrap4-dialog

assets/js/bootstrapdialog/css/bootstrap-dialog.min.css

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+.bootstrap-dialog .modal-header{border-top-left-radius:4px;border-top-right-radius:4px}.bootstrap-dialog .bootstrap-dialog-title{color:#fff;display:inline-block;font-size:16px}.bootstrap-dialog .bootstrap-dialog-message{font-size:14px}.bootstrap-dialog .bootstrap-dialog-button-icon{margin-right:3px}.bootstrap-dialog .bootstrap-dialog-close-button{font-size:20px;float:right;opacity:.9;filter:alpha(opacity=90)}.bootstrap-dialog .bootstrap-dialog-close-button:hover{cursor:pointer;opacity:1;filter:alpha(opacity=100)}@media(min-width:1172px){.bootstrap-dialog .modal-xl{max-width:95%}}.bootstrap-dialog .modal-lg .bootstrap4-dialog-button:first-child{margin-top:8px}.bootstrap-dialog.type-default .modal-header{background-color:#fff}.bootstrap-dialog.type-default .bootstrap-dialog-title{color:#333}.bootstrap-dialog.type-info .modal-header{background-color:#17a2b8}.bootstrap-dialog.type-primary .modal-header{background-color:#007bff}.bootstrap-dialog.type-secondary .modal-header{background-color:#6c757d}.bootstrap-dialog.type-success .modal-header{background-color:#28a745}.bootstrap-dialog.type-warning .modal-header{background-color:#ffc107}.bootstrap-dialog.type-danger .modal-header{background-color:#dc3545}.bootstrap-dialog.type-light .modal-header{background-color:#f8f9fa}.bootstrap-dialog.type-dark .modal-header{background-color:#343a40}.bootstrap-dialog.size-large .bootstrap-dialog-title{font-size:24px}.bootstrap-dialog.size-large .bootstrap-dialog-close-button{font-size:30px}.bootstrap-dialog.size-large .bootstrap-dialog-message{font-size:18px}.bootstrap-dialog .icon-spin{display:inline-block;-moz-animation:spin 2s infinite linear;-o-animation:spin 2s infinite linear;-webkit-animation:spin 2s infinite linear;animation:spin 2s infinite linear}.bootstrap-dialog-footer-buttons{display:flex}@-moz-keyframes spin{0{-moz-transform:rotate(0)}100%{-moz-transform:rotate(359deg)}}@-webkit-keyframes spin{0{-webkit-transform:rotate(0)}100%{-webkit-transform:rotate(359deg)}}@-o-keyframes spin{0{-o-transform:rotate(0)}100%{-o-transform:rotate(359deg)}}@-ms-keyframes spin{0{-ms-transform:rotate(0)}100%{-ms-transform:rotate(359deg)}}@keyframes spin{0{transform:rotate(0)}100%{transform:rotate(359deg)}}.bootstrap-dialog-header{display:contents}