Training hotkey for the eigth unit doesn't work

[Stan]

The game advertises the training hotkey for the eigth unit to be comma, however pressing that key does nothing. It is because in gui\session\hotkeys\training.xml there is no code to handle it.

Simple solution is to add

	<!-- queue 8th unit in the training queue  -->
	<object hotkey="session.queueunit.8	">
		<action on="Press">addTrainingByPosition(7);</action>
	</object>

Better solution is to rewrite that code to use the Oriented Object paradigm.