Using gettext/ngetext to replace array of words in wp admin

gettext.php

<?php

add_filter(  'gettext',  'wps_translate_words_array'  );
add_filter(  'ngettext',  'wps_translate_words_array'  );
function wps_translate_words_array( $translated ) {
     $words = array(
                        // 'word to translate' = > 'translation'
                        'Posts' => 'Article',
                        'Post' => 'Articles',
                        'Pages' => 'Stuffing',
                        'Media' => 'Upload Images',
                        'Links' => 'Blog Roll',
                    );
     $translated = str_ireplace(  array_keys($words),  $words,  $translated );
     return $translated;
}