Add support for placeholders (__1__, __2__, etc) in the localised "help" of custom commands registered by using commands.add_command.
Currently, the placeholder __1__ will be displayed as "1" if I type /help (the command) in the game. But it works as expected if I print the string using player.print.
![Geek :geek:](./images/smilies/icon_e_geek.gif)