Help screen does not show key for settings

To reproduce:
1. Go to board view
2. Show help ('?')
3. 'a' is said to show settings AND add tasks. This is wrong.

'a' should add tasks, which it does. Somehow the key for showing settings has been dropped. It should show the key 's'. Pressing 's' correctly shows the settings screen for the selected element. It is thus only the help text that needs to be updated.
