Adds a hint indicator on external Sources on Dataset description. (Ticket #67)

dmp-frontend/src/app/ui/misc/dataset-description-form/components/form-field/form-field.component.html

@@ -29,6 +29,7 @@
 					<mat-error *ngIf="form.get('value').hasError('required')">{{'GENERAL.VALIDATION.REQUIRED' | translate}}
 					</mat-error>
 				</div>
+				<mat-hint>{{ "TYPES.DATASET-PROFILE-COMBO-BOX-TYPE.EXTERNAL-SOURCE-HINT" | translate }}</mat-hint>
 			</mat-form-field>
 			<mat-form-field *ngIf="form.get('data').value.type === datasetProfileComboBoxTypeEnum.WordList" class="col-md-12">
 				<mat-select [formControl]="form.get('value')" placeholder="{{ form.get('data').value.label | translate }}" [required]="form.get('validationRequired').value">