hi,
i think this is what you looking for
language file main.php
$lang['no_categories'] = "No categories found.";
$lang['no_images'] = "There are no images in this category.";
$lang['select_category'] = "Select category";
$lang['categories'] = "Categories";
$lang['sub_categories'] = "Subcategories";
$lang['category'] = "Category:";
$lang['site_stats'] = "<b>{total_images}</b> images in <b>{total_categories}</b> categories.";