[Plugin : Language Switcher] apply_filters()

Hello. I use the plugin Language Switcher on my site. I have a little problem because i want to exclude one category in my post (i mean not to display one category that are listed at the end of each post). The exclusion works but i end with someting that don’t work with the plugin. I need to filter the category name to display them correctly. The plugin page explained how to do sort of but i’m not a good coder. My code :

<?php foreach((get_the_category()) as $category) {
         if ($category->cat_ID <> '15') { echo apply_filters(’the_category’, $category->cat_name . ' '); }}

i tried this but it doesn’t work :

<?php foreach((get_the_category()) as $category) {
         if ($category->cat_ID <> '15') { echo apply_filters(’the_category’, $category->cat_name . ' '); }}

any help ?