title: How to get all translations configured in Angular project by i18n?
body: <p>I am using i18n (internationalization) in Angular 7 with the following languages: en, es, fr, it, pl, pt and ru.</p>
  
  <p>I need to get all languages configured in the project for setting a drop-down list with their values. How can I get these languages, set in JSON files, to use them in the drop-down list?</p>
  
  <p>Can I loop the files in the folder, at least, and recover the filenames?</p>