[@robkk Moderator 11 years, 10 months ago]

the loop-forums.php file you downloaded from github

and in the same file you can change word Freshness to whatever you want.

just change this

<li class="bbp-forum-freshness"><?php _e( 'Freshness', 'bbpress' ); ?></li>

to something like this for example.

<li class="bbp-forum-freshness"><?php _e( 'Last Post', 'bbpress' ); ?></li>