Programmatically set strings translations in hook_update_N()

strings_translations_hook_update_N.php

/**
 * Implements hook_update_N().
 */
function hook_update_N(&$sandbox) {
  $report = array(
    'skips' => 0,
    'updates' => 0,
    'deletes' => 0,
    'additions' => 0
  );

  $translations = array(
    array(
      'src' => 'What is PayPal?',
      'tr' => 'Was ist PayPal?',
      'lc' => 'de',
    ),
    array(
      'src' => 'What is PayPal?',
      'tr' => '¿Qué es PayPal?',
      'lc' => 'es',
    ),
    array(
      'src' => 'How PayPal works',
      'tr' => 'So funktioniert PayPal',
      'lc' => 'de',
    ),
    array(
      'src' => 'How PayPal works',
      'tr' => 'Cómo funciona PayPal',
      'lc' => 'es',
    ),
  );

  foreach ($translations as $tr) {
    _locale_import_one_string_db($report, $tr['lc'], '', $tr['src'], $tr['tr'], 'default', '', LOCALE_IMPORT_OVERWRITE);
  }
}