locale_translate_get_interface_translation_files

locale_translate_get_interface_translation_files(array $projects = array(), array $langcodes = array())

function locale_translate_get_interface_translation_files(array $projects = array(), array $langcodes = array()) {
  module_load_include('compare.inc', 'locale');
  $files = array();
  $projects = $projects ? $projects : array_keys(locale_translation_get_projects());
  $langcodes = $langcodes ? $langcodes : array_keys(locale_translatable_language_list());

  // Scan the translations directory for files matching a name pattern
  // containing a project name and language code: {project}.{langcode}.po or
  // {project}-{version}.{langcode}.po.
  // Only files of known projects and languages will be returned.
  $directory = \Drupal::config('locale.settings')->get('translation.path');
  $result = file_scan_directory($directory, '![a-z_]+(\-[0-9a-z\.\-\+]+|)\.[^\./]+\.po$!', array('recurse' => FALSE));

  foreach ($result as $file) {
    // Update the file object with project name and version from the file name.
    $file = locale_translate_file_attach_properties($file);
    if (in_array($file->project, $projects)) {
      if (in_array($file->langcode, $langcodes)) {
        $files[$file->uri] = $file;
      }
    }
  }

  return $files;
}