How to debug failed load_theme_textdomain()?

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I made my theme ready for translation. My text domain is my_theme and my .po and .mo (de_DE.po and de_DE.mo) files are located in a subfolder languages in my themes folder.

In my functions.php I added the following code:

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add_action('after_setup_theme', 'my_theme_setup');
function my_theme_setup(){
    load_theme_textdomain('my_theme', get_template_directory() . '/languages');
}

My backend language is “German” but the translation isn’t loaded. Any ideas?

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  1. load_theme_textdomain() returns TRUE on success and FALSE if no file was found. For debugging try the following change:

    function my_theme_setup(){
    $path = get_template_directory() . '/languages';
    $result = load_theme_textdomain('my_theme', $path );

    if ( $result )
        return;

   $locale = apply_filters( 'theme_locale', get_locale(), 'my_theme' );
   die( "Could not find $path/$locale.mo." );
}