Change wording of default thumbnail metabox

2 comments

1. This is usually what I go with:

   /** Use "Featured Image" Box As A Custom Box **/
   function customposttype_image_box() {   
       remove_meta_box('postimagediv', 'page', 'side');
       add_meta_box('postimagediv', __('Set Dat Image'), 'post_thumbnail_meta_box', 'page', 'side');
   
   }
   add_action('do_meta_boxes', 'customposttype_image_box');
   
   /** Change "Featured Image" box Link Text **/
   function custom_admin_post_thumbnail_html( $content ) {
       global $post;
       if($post->post_type == 'page')
       {
           $content = str_replace( __( 'Set featured image' ), __( 'Upload dat Image' ), $content);
           $content = str_replace( __( 'Remove featured image' ), __( 'Remove dat image' ), $content);
       }
   
       return $content;
   }
   add_filter( 'admin_post_thumbnail_html', 'custom_admin_post_thumbnail_html' );
   

2. Use media_view_strings to filter the default text.

   Use the below in the active theme’s function.php file

   add_filter( 'media_view_strings', function( $strings ) {
      $strings['setFeaturedImageTitle'] = __( 'Set default thumbnail' );
      $strings['setFeaturedImage']    = __( 'Set default thumbnail' );
   
      return $strings;
   });
   

   Found in WordPress/wp-includes/media.php

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