corrected spelling and improve command description

Changelog:

• Corrected spelling and other minor mistakes.
• Corrected the behavior to the description messages to sub-labels and added same thing to the main command. You can now allow players use ? or help after the command. For example /maincommand ? or /maincommand sublabel ? , it will only show message ingame and not execute the command. But only if the last part of the command is either ? or help and the description message is set.