translate strings from format_plural
Thanks all 

I found the solution as that comment form-plural in po

Edited on of the po files after exporting the last state to keep translation.

Import the file using drush (uploading from the interface always fail)

Installed drush_lang module 

Apply that patch langimp relative path in /home/$_USER/.drush/drush_language

Clear cache for drupal and drush (drush cache-clear drush) 

use the commands that module provides and every thing will be fine