Adds missing localization (for "System fields")

src/Umbraco.Web.UI.Client/src/assets/lang/en.ts

@@ -1562,6 +1562,7 @@ export default {
 		ascending: 'ascending',
 		descending: 'descending',
 		template: 'Template',
+		systemFields: 'System fields',
 	},
 	grid: {
 		media: 'Image',

src/Umbraco.Web.UI.Client/src/packages/templating/modals/templating-page-field-builder/components/template-field-dropdown-list/template-field-dropdown-list.element.ts

@@ -152,7 +152,7 @@ export class UmbTemplateFieldDropdownListElement extends UmbLitElement {
 			<uui-combobox id="preview">
 				<uui-combobox-list @change=${this.#onChange}>
 					<uui-combobox-list-option value="system">
-						<strong>${this.localize.term('formSettings_systemFields')}</strong>
+						<strong>${this.localize.term('template_systemFields')}</strong>
 					</uui-combobox-list-option>
 					<uui-combobox-list-option value="document-type" display-value=${this.localize.term('content_documentType')}>
 						<strong> ${this.localize.term('content_documentType')} </strong>