Looks like it is probably a language file/definition missing from your languages directory missing from your template's install. Off hand not sure which file would be best to include it in, of course could do so in your includes/languages/YOUR_LANGUAGE.php file or the template's override for that language.
Basically would need something like:
Code:
define('SUBCATEGORY_TITLE', 'your text');
added in to replace the constant displayed with whatever it is you want to have shown.
Or of course the fully trusted suggestion of DrByte would work better. :)
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