My custom theme does not load the translations

Question

I made a custom theme named testTheme having these files:

And I wanted to put some translation on it therefore I created the required .po and .mo files for greek language via poedit as seen in the following image:

But I cannot make it load the custom translations I created via poedit. Do you have any idea how I will load them?

Edit 1

The functions.php as asked:

<?php


if(!function_exists('loadThemerequirements')):

function loadThemerequirements()
{
    load_theme_textdomain( 'testTheme', get_template_directory() . '/languages' );
}

endif;

add_action( 'after_setup_theme', 'loadThemerequirements' );

Update1

The translations files were moved and renamed like that:

Still Same result.

Edit 2:

This is not a child theme but a from-scratch made one.

Edit 3:

I tried renaming the .po and .mo files as el_GR.po and el_GR.mo still same result. I also tried to rename them in to testTheme/el_GR.po and testTheme/el_GR.mo without any success.

Update 2

The theme is in this git repository: https://github.com/pc-magas/testTheme

Edit 1

I changed my 404 page (that has some text to be translated into greek) like that:

<?php
get_header();
?>
<div class="fullpage_center">
    <div>
        <h1>404</h1>
        <p><?php _e('The requested page does not exist.','testTheme');?></p>
    </div>
</div>
<?php
    wp_reset_query(); //resetting the page query
    get_footer();
?>

A sample of my page and the translated text is:

As you can see still no result.

Answer 1

1. Change your translate file name to el_GR.po and el_GR.mo:

   el_GR.po in: testTheme\languages\el.po
   el_GR.mo in: testTheme\languages\el.mo
   

2. In 404.php file for print text you should write code like this (add textdomain):

   <?php _e('The requested page does not exist.', 'testTheme'); ?>
   

Second parameter is textdomain.

Answer 2

If you have a child theme, in your function.php you have to change get_template_directory() by get_stylesheet_directory()