Not the ideal solution but works.
In JigoShop/edit product category/name:
[:en] Big [:fr] Grand
In functions.php
function translate_q ($echo) {
if (function_exists('qtrans_split')) {
$selectLanguage = qtrans_split($echo);
return $selectLanguage[qtrans_getLanguage()];
} else {
return $echo;
}
}
qtrans_split and qtrans_getLanguage are functions created by qTranslate.
From JigoShop plugin directory I opened jigoshop_template_functions.php, I grabbed from jigoshop_breadcrumb() function all the echos in $echo variable and at the end I have:
echo function_exists('translate_q') ? translate_q($echo) : $echo;
You will have to do the same thing in other places in JigoShop. I posted here to be a starting point.