Different Header Images for Different Languages using WPML

Hello
I'm using WPML for http://papallaitants.fr/
It's going ok so far but I'd like the banner to be in French when it's a French reader and English when it's an English reader.

I found this https://wpml.org/forums/topic/can-i-...each-language/ which is helpful. It tells me to add some code.

"you need insert the link into img tags.

Then add the code into your header.php file where you display your logo.

<?php
if (ICL_LANGUAGE_CODE == 'en') { ?>

<img src="http://earlymusicbesalu.com/site/wp-content/themes/earlymusicbesalu/images/logo-eng-2012.png"/>

<?php
} else if (ICL_LANGUAGE_CODE == 'es') { ?>
<img src="http://earlymusicbesalu.com/site/wp-content/themes/earlymusicbesalu/images/logo-es-2012.png" />

<?php
} else if (ICL_LANGUAGE_CODE == 'ca') {?>
<img src="http://earlymusicbesalu.com/site/wp-content/themes/earlymusicbesalu/images/logo-ca-2012.png" />

<?php
} else if (ICL_LANGUAGE_CODE == 'fr') {
?>
<img src="http://earlymusicbesalu.com/site/wp-content/themes/earlymusicbesalu/images/logo-fr-2012.png"/>
<?php
}
?>

This seems clear enough but where is the header.php file?
Or is there a different way to do it?