Minor - changed the variable name for categories

main/admin/course_category.php

@@ -251,7 +251,7 @@ if(count($Categories)>0)
 		<a href="<?php echo api_get_self(); ?>?category=<?php echo Security::remove_XSS($category); ?>&amp;action=delete&amp;id=<?php echo Security::remove_XSS($enreg['code']); ?>" onclick="javascript:if(!confirm('<?php echo addslashes(api_htmlentities(get_lang('ConfirmYourChoice'),ENT_QUOTES,$charset)); ?>')) return false;"><?php Display::display_icon('delete.gif', get_lang('DeleteNode'));?></a>
 		<a href="<?php echo api_get_self(); ?>?category=<?php echo Security::remove_XSS($category); ?>&amp;action=moveUp&amp;id=<?php echo Security::remove_XSS($enreg['code']); ?>&amp;tree_pos=<?php echo $enreg['tree_pos']; ?>"><?php Display::display_icon('up.gif', get_lang('UpInSameLevel'));?></a>
 		<?php echo $enreg['name']; ?>
-		(<?php echo $enreg['children_count']; ?> <?php echo get_lang("Categories"); ?> - <?php echo $enreg['nbr_courses']; ?> <?php echo get_lang("Courses"); ?>)
+		(<?php echo $enreg['children_count']; ?> <?php echo get_lang('CategoriesNumber'); ?> - <?php echo $enreg['nbr_courses']; ?> <?php echo get_lang('Courses'); ?>)
 	  </li>
 	<?php
 	}