Where is the right .mo file inside the language repository?

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To translate you need few things first in place.

  1. Create a directory called languages inside wp-content .
  2. Now define your country and locale in wp-config.php file. For example as you wish to translate into italian. You should add these lines.
    define (‘WPLANG’, ‘it_IT’);
  3. Now as you have read on forums you need to put the .po file in languages directory
    for example This file.

This should solve your problem.