Translations not making it into Block UI but work in the rest of the plugin

It seems like you do not have any JavaScript localization files to use with wp_set_script_translations(). If we consult the Gutenberg/JavaScript documentation for internationalization:

The translation files must be in the JED 1.x JSON format.

[…]

<?php
function myguten_set_script_translations() {
  wp_set_script_translations( 'myguten-script', 'myguten', plugin_dir_path( __FILE__ ) . 'languages' );
}
add_action( 'init', 'myguten_set_script_translations' );

WordPress will check for a file in that path with the format ${domain}-${locale}-${handle}.json as the source of translations. Alternatively, instead of the registered handle you can use the md5 hash of the relative path of the file, ${domain}-${locale} in the form of ${domain}-${locale}-${md5}.json.

Checking the branch you supplied, I do not see any candidate .json files in the path you called wp_set_script_translations() with that could be used as JavaScript translations.

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