Improve login messaging

app/soapbox/actions/auth.js

@@ -136,7 +136,7 @@ export function logIn(username, password) {
       if (error.response.data.error === 'mfa_required') {
         throw error;
       } else {
-        dispatch(snackbar.error('Invalid username or password.'));
+        dispatch(snackbar.error('Wrong username or password'));
       }
       throw error;
     });

app/soapbox/selectors/index.js

@@ -126,7 +126,7 @@ export const getAlerts = createSelector([getAlertsBase], (base) => {
       key: item.get('key'),
       className: `snackbar snackbar--${item.get('severity', 'info')}`,
       activeClassName: 'snackbar--active',
-      dismissAfter: 5000,
+      dismissAfter: 6000,
     });
   });