67478: LookupRelationService, external source tabs, list implementation

resources/i18n/en.json5

src/app/core/core.module.ts

src/app/core/data/lookup-relation.service.ts

...ernal-source-entry-list-submission-element.component.html

...xternal-source-entry-list-submission-element.component.ts

...lookup-modal/dynamic-lookup-relation-modal.component.html

...n-lookup-modal/dynamic-lookup-relation-modal.component.ts

...ynamic-lookup-relation-external-source-tab.component.html

.../dynamic-lookup-relation-external-source-tab.component.ts

...rch-tab/dynamic-lookup-relation-search-tab.component.html

...earch-tab/dynamic-lookup-relation-search-tab.component.ts

...on-tab/dynamic-lookup-relation-selection-tab.component.ts