Shortcode created to check language not works

In a shortcode you always need to return something. It’s also good practice to make your code very logical and readable. Here are a list of PHP Logical Operators: http://php.net/manual/en/language.operators.logical.php
Complete List of WordPress Locale Codes: https://wpastra.com/docs/complete-list-wordpress-locale-codes/

Below an example as English as a backup/fallback language:

function coupon_shortcode() {
    $logged_in = is_user_logged_in();

    if (get_locale() == 'fr_FR' && $logged_in == false) {
        return '<div class="discount"><h3 style="text-align: left;">C’est votre première commande?</h3><p style="text-align: left;">Demandez votre code de réduction d’une valeur de 20 Euros.</p><p style="text-align: left;"><span style="text-decoration: underline;"><a class="myButton" href="https://atremoplus.fr/bienvenue/">Recevoir mon code</a></span></p></div>';
    }
    elseif (get_locale() == 'de_DE' && $logged_in == false) {
        return '<div class="discount"><h3 style="text-align: left;">Ist dies Ihre erste Bestellung?</h3><p style="text-align: left;"> Fordern Sie Ihren persönlichen 20 Euros Rabatt.</p><p style="text-align: left;"><span style="text-decoration: underline;"><a class="myButton" href="https://www.atremoplus.net/de/atremoplus-kaufen/">Gutscheincode anfordern</a></span></p></div>';
    }
    elseif (get_locale() == 'es_ES' && $logged_in == false) {
        return '<div class="discount"><h3 style="text-align: left;">¿Este es su primer pedido?</h3><p style="text-align: left;"> Solicite su código de descuento por un valor de 20 euros.</p><p style="text-align: left;"><span style="text-decoration: underline;"><a class="myButton" href="https://www.atremoplus.net/es/comprar-atremoplus/">Recibir mi código</a></span></p></div>';
    }
    elseif ($logged_in == false) { // Backup/fallback language is English and is shown only when user is not logged in
        return '<div class="discount"><h3 style="text-align: left;">Is this your first order?</h3><p style="text-align: left;">Request your discount code for a value of 20 euros.</p><p style="text-align: left;"><span style="text-decoration: underline;"><a class="myButton" href="https://www.atremoplus.net/welcome-coupon/">Receive my code 
</a></span></p></div>';
    }
}
add_shortcode('coupon', 'coupon_shortcode');

Below an example as Spanish as a backup/fallback language:

function coupon_shortcode() {
    $logged_in = is_user_logged_in();

    if (get_locale() == 'en_US' && $logged_in == false) {
        return '<div class="discount"><h3 style="text-align: left;">Is this your first order?</h3><p style="text-align: left;">Request your discount code for a value of 20 euros.</p><p style="text-align: left;"><span style="text-decoration: underline;"><a class="myButton" href="https://www.atremoplus.net/welcome-coupon/">Receive my code
    </a></span></p></div>';
    }
    elseif (get_locale() == 'fr_FR' && $logged_in == false) {
        return '<div class="discount"><h3 style="text-align: left;">C’est votre première commande?</h3><p style="text-align: left;">Demandez votre code de réduction d’une valeur de 20 Euros.</p><p style="text-align: left;"><span style="text-decoration: underline;"><a class="myButton" href="https://atremoplus.fr/bienvenue/">Recevoir mon code</a></span></p></div>';
    }
    elseif (get_locale() == 'de_DE' && $logged_in == false) {
        return '<div class="discount"><h3 style="text-align: left;">Ist dies Ihre erste Bestellung?</h3><p style="text-align: left;"> Fordern Sie Ihren persönlichen 20 Euros Rabatt.</p><p style="text-align: left;"><span style="text-decoration: underline;"><a class="myButton" href="https://www.atremoplus.net/de/atremoplus-kaufen/">Gutscheincode anfordern</a></span></p></div>';
    }
    elseif ($logged_in == false) { // Backup/fallback language is Spanish and is shown only when user is not logged in
        return '<div class="discount"><h3 style="text-align: left;">¿Este es su primer pedido?</h3><p style="text-align: left;"> Solicite su código de descuento por un valor de 20 euros.</p><p style="text-align: left;"><span style="text-decoration: underline;"><a class="myButton" href="https://www.atremoplus.net/es/comprar-atremoplus/">Recibir mi código</a></span></p></div>';
    }
}
add_shortcode('coupon', 'coupon_shortcode');

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