Where is <?=$txt['something']?>

[nyo08]

Hello,
 
I'm a newbie in processwire.
I have a problem : 
 
In my file head.inc, in the sidebar, there is a link :

<a href="http://www."><div class="sidebar-block sidebar-corps"><?=$txt['espaceCorps']?></div></a>

I want to change the text of the link (the text  behind the <?=$txt['espaceCorps']?>, but I don't find where I can change that in the admin site, or in the code....

Any idea ?

Thanks.

[Jonathan Dart]

It's hard to say without more information. $txt isn't a standard processwire variable, do you know where $txt gets defined? Figuring out what $txt is might help you find your answer.