feat: Implement a cancel button

frontend/src/reducers/index.ts

@@ -45,6 +45,7 @@ interface IState {
     review: {
         current: IReviewCard;
 
+        dialogOpen: boolean;
         loading: boolean;
         vocab: IVocab[];
         metadata: IReviewMetadata;
@@ -104,6 +105,7 @@ const initialState: IState = {
     review: {
         current: {} as IReviewCard,
 
+        dialogOpen: false,
         loading: true,
         vocab: [],
         metadata: {} as IReviewMetadata,
@@ -251,6 +253,12 @@ export function LateinicusApp(state: IState = initialState, action: any) {
                     loadingLR: action.state,
                 }),
             });
+        case Actions.REVIEW_SET_DIALOG:
+            return Object.assign({}, state, {
+                review: Object.assign({}, state.review, {
+                    dialogOpen: action.state,
+                }),
+            });
         default:
             // Ignore the initialization call to the reducer. By that we can
             // catch all actions that are not implemented