help php language translation

can anyone please help me or at least guide me on how to change to languge of the months and days displayed on the calender from english to french.
thank you

<?php
# PHP Calendar (version 2.3), written by Keith Devens
function daac_make_calendar($year, $month, $activeDay=”, $day_name_length = 3, $month_href = NULL, $first_day = 0, $pn = array()) {
global $wpdb, $entries_table;
# Get unavailable days from the db
$unavailableDays = get_option(‘daac_unavailable_days’, array());
# Get the booked range from the db for a period of one month
$rangeStart = mktime(0,0,0,$mois,0,$year);
$rangeEnd = mktime(0,0,0,$mois+1,0,$year);
$bookedDays = array();
$sql = “select date from “.$wpdb->prefix.$entries_table.” where unix_timestamp(date) between $rangeStart and $rangeEnd”;
$results = $wpdb->get_results($sql, ARRAY_A);
if(count($results) > 0) {
for($i=0;$i<count($results);$i++) {
$row = $results[$i];
$bookedDate = $row[“date”];
$bookedDay = explode(‘-‘,$bookedDate);
$bookedDays[] = $bookedDay[2]; // (Y-m-d)
}
}
$first_of_month = gmmktime(0,0,0,$month,1,$year);

# remember that mktime will automatically correct if invalid dates are entered
# for instance, mktime(0,0,0,12,32,1997) will be the date for Jan 1, 1998
# this provides a built in “rounding” feature to daac_make_calendar()

$day_names = array(); # generate all the day names according to the current locale

for($n=0,$t=(3+$first_day)*86400; $n<7; $n++, $t+=86400) # January 4, 1970 was a Sunday
$day_names[$n] = ucfirst(gmstrftime(‘%A’,$t)); # %A means full textual day name

list($month, $year, $month_name, $weekday) = explode(‘,’,gmstrftime(‘%m,%Y,%B,%w’,$first_of_month));
$weekday = ($weekday + 7 – $first_day) % 7; #adjust for $first_day
$title = htmlentities(ucfirst($month_name)).’ ‘.$year; # note that some locales don’t capitalize month and day names

#Begin calendar. Uses a real <caption>. See https://diveintomark.org/archives/2002/07/03
@list($p, $pl) = each($pn); @list($n, $nl) = each($pn); # previous and next links, if applicable
if($p) $p = ‘<span>’.($pl ? ‘‘.$p.’‘ : $p).'</span> ‘;
if($n) $n = ‘ <span>’.($nl ? ‘‘.$n.’‘ : $n).'</span>’;
$calendar = ‘<table class=”daac-calendar”>’.”\n”.
‘<thead>
<tr>
<td id=”daac_calendar_prev” class=”daac-calendar-control”>«</td>
<td class=”daac-calendar-caption” colspan=”5″><h3 class=”daac-calendar-month”>’.$p.($month_href ? ‘‘.$title.’‘ : $title).$n.'</h3></td>
<td id=”daac_calendar_next” class=”daac-calendar-control daac-calendar-control-next”>»</td>
</tr>
</thead>’.”\n”.
‘<tr>’;

if($day_name_length){ #if the day names should be shown ($day_name_length > 0)
#if day_name_length is >3, the full name of the day will be printed
foreach($day_names as $d)
$calendar .= ‘<th abbr=”‘.htmlentities($d).'”>’.htmlentities($day_name_length < 4 ? substr($d,0,$day_name_length) : $d).'</th>’;
$calendar .= “</tr>\n<tr>”;
}

if($weekday > 0) $calendar .= ‘<td class=”daac-calendar-cell-pad” colspan=”‘.$weekday.'”> </td>’; #initial ’empty’ days
for($day=1,$days_in_month=gmdate(‘t’,$first_of_month); $day<=$days_in_month; $day++,$weekday++) {
$classes = ‘daac-calendar-day’;
$Ymd = implode(‘-‘,array($year,$month,str_pad($day, 2, ‘0’, STR_PAD_LEFT)));
if($weekday == 7){
$weekday = 0; #start a new week
$calendar .= “</tr>\n<tr>”;
}
if(!empty($activeDay)) {
if($activeDay == implode(‘-‘, array($year, str_pad($month, 2, ‘0’, STR_PAD_LEFT), str_pad($day, 2, ‘0’, STR_PAD_LEFT)))) {
$classes .= ‘ daac-calendar-active’;
}
}
if(implode(‘-‘, array($year,$month,str_pad($day, 2, ‘0’, STR_PAD_LEFT))) == date(‘Y-m-d’)) {
$classes .= ‘ daac-calendar-today’.(empty($activeDay) ? ‘ daac-calendar-active’ : ”);
}
if(in_array($Ymd, $unavailableDays)) {
$classes .= ‘ daac-calendar-unavailable’;
}
else {
$classes .= ‘ daac-calendar-bookable’;
if(in_array($day,$bookedDays)) {
$classes .= ‘ daac-calendar-booked’;
}
}

$calendar .= ‘<td class=”‘.$classes.'”>’.$day.'<input type=”hidden” name=”daac_current_day” value=”‘.$Ymd.'” /></td>’;
}

if($weekday != 7) $calendar .= ‘<td class=”daac-calendar-cell-pad” colspan=”‘.(7-$weekday).'”> </td>’; #remaining “empty” days
$calendar .= “</tr>\n</table>\n”;
$calendar .= “<input type=\”hidden\” name=\”daac_month\” value=\””.$month.”\” /><input type=\”hidden\” name=\”daac_year\” value=\””.$year.”\” />”;
return $calendar;
}

function daac_get_entries($year, $month, $day) {
global $wpdb, $entries_table;
$bookings = array(); // output
$sql = “SELECT * FROM “.$wpdb->prefix.$entries_table.” WHERE date = ‘$year-$month-$day’ ORDER BY start ASC”;
$results = $wpdb->get_results($sql, ARRAY_A);
if(count($results) > 0) {
for($i=0; $i<count($results); $i++) {
$row = $results[$i];
$bookings[] = array(
‘title’ => $row[“title”],
‘start’ => $row[“start”],
‘end’ => $row[“end”],
‘id’ => $row[“id”]
);
}
}
return $bookings;
}
?>