fix: Fix a typo

src/components/app.tsx

@@ -318,7 +318,9 @@ export default class Application extends React.Component<{}, IState> {
                             <ListItemIcon>
                                 <BookIcon />
                             </ListItemIcon>
-                            <ListItemText primary="Widerholen" />
+                            <ListItemText>
+                                Vokabeln üben
+                            </ListItemText>
                         </ListItem>
                         <ListItem
                             component={Link}

src/pages/dashboard.tsx

@@ -60,6 +60,12 @@ export default class Dashboard extends React.Component<IProps> {
                             Letzte Wiederholung
                         </Typography>
                         <SummaryTable reviewMeta={this.props.getLastReview} />
+
+                        <Button
+                            component={Link}
+                            to="/review/queue">
+                            Vokabeln üben
+                        </Button>
                     </Paper>
                 </Grid>
             </Grid>