如何在PHP的特定日期后添加“呃”？

Question

I am working on a html/php code as shown below:

<?php if(ICL_LANGUAGE_CODE=='fr'){  ?>  /* When the page is in French */
   <time datetime="<?php echo esc_attr(date_format($ts, 'H:i d-m-Y')) ?>"
           data-timezone="<?php echo esc_attr($tz_param) ?>"><?php echo ucfirst(date_i18n( 'j F H:i', $ts->getTimeStamp()-(60*60*4))); ?>
   </time>
<?php }  ?>

The above html/php code displays the following date/time on the webpage:

1 mars 2019 03:45   

Problem Statement:

I am wondering what changes I should make in the html/php code above when days of the month is "1" then substitute "1er". eg:

1er mars 2019