WordPress - Overriding Gutenberg text strings with translations

test.json

{
  "domain": "messages",
  "locale_data": {
    "messages": {
      "": {
        "domain": "messages"
      },
      "This block contains unexpected or invalid content.": [
        "Poop, this block sucks now"
      ]
    }
  },
  "comment": {
    "reference": "wp-includes/js/dist/block-editor.js"
  }
}

thegutes.php

<?php
// Filter for loading custom json to override the gutes.
add_filter('load_script_translation_file', 'override_core_translation_file', 10, 3);

function override_core_translation_file($file, $handle, $domain)
{
    // Specify the script handle for which you want to replace the translations.
    if ('default' === $domain) {
        // Path to your custom JSON translation file.
        // In this case in a folder 'languages' relataive to this file.
        $file = plugin_dir_path(__FILE__) . 'languages/test.json';
    }

    return $file;
}