fix: The client and server send the ILevel type differently

frontend/src/models/level.ts

@@ -1,6 +1,6 @@
 export interface ILevel {
     name: string;
-    desc: string;
+    description: string;
     level: number;
 
     done: boolean;

frontend/src/pages/dashboard.tsx

@@ -74,7 +74,7 @@ export default class Dashboard extends React.Component<IProps> {
                             <Typography variant="title" component="p">{level.name}</Typography>
                             <br />
                             <Typography component="p">
-                                {level.desc}
+                                {level.description}
                             </Typography>
                             <Button
                                 component={Link}

frontend/src/pages/levelList.tsx

@@ -68,7 +68,7 @@ export default class Dashboard extends React.Component<IProps> {
                         <Typography variant="title" component="p">{level.name}</Typography>
                         <br />
                         <Typography component="p">
-                            {level.desc}
+                            {level.description}
                         </Typography>
                     </CardContent>
                     <CardActions>