How to edit existing user groups in the forum?

[axtona]

The How to edit existing user groups in the forum? has been submitted and is now available for free download. Big thanks to the contribution from our member @axtona !

Is there a way off adding the usergroup coours on the forum board without using an addon?
Just a few template edits.

node_list_forum

<li class="node-extra-user"><xf:username user="{$extras.LastPostUser}" defaultname="{$extras.last_post_username}" rich="true" /></li>

poll_voters

<li><xf:username user="$vote.User" rich="true" /></li>

thread_list_macros

<li><xf:username user="$thread.User"...

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