submit date on blur when in accessibility mode

As the accessibility mode has no date picker, we can submit it right away

frontend/app/components/wp-edit/field-types/wp-edit-date-field.directive.html

@@ -7,6 +7,7 @@
          type="text"
          class="wp-inline-edit--field"
          transform-date-value
+         ng-blur="vm.onlyInAccessibilityMode(vm.handleUserBlur)"
          ng-required="vm.field.required"
          focus="vm.shouldFocus()"
          focus-priority="vm.shouldFocus()"

frontend/app/components/wp-edit/wp-edit-field/wp-edit-field.directive.ts

@@ -62,6 +62,7 @@ export class WorkPackageEditFieldController {
               protected $q,
               protected FocusHelper,
               protected NotificationsService,
+              protected ConfigurationService,
               protected wpCacheService: WorkPackageCacheService,
               protected I18n) {
 
@@ -251,6 +252,12 @@ export class WorkPackageEditFieldController {
     this.deactivate();
   }
 
+  public onlyInAccessibilityMode(callback) {
+    if (this.ConfigurationService.accessibilityModeEnabled()) {
+      callback.apply(this);
+    }
+  }
+
   protected buildEditField(): ng.IPromise<any> {
     return this.formCtrl.loadSchema().then(schema => {
       this.field = <EditField>this.wpEditField.getField(this.workPackage, this.fieldName, schema[this.fieldName]);