I'm using Civicrm v4.7.19 on Drupal,
for using another language (like ES/DE) I've been creating directory: /public_html/sites/all/modules/civicrm/l10n
And the "mo" files placed in these addresses [both for testing]: /public_html/sites/all/modules/civicrm/l10n/es_ES/civicrm.mo /public_html/sites/all/modules/civicrm/l10n/de_DE/LC_MESSAGES/civicrm.mo
But the Localization settings page don't show the languages.