This is the finally code that is working like a chram
<?php
$taxonomy = get_taxonomy( get_queried_object()->taxonomy );
$term = get_term_by( 'slug', get_query_var( 'term' ), get_query_var( 'taxonomy' ) );
get_header(); ?>
<h1 class="page-title">Θέσεις εργασίας για <?php echo $term->name; ?></h1>
<div id="content">
<article id="post-<?php the_ID(); ?>" <?php post_class('post'); ?>>
<?php echo do_shortcode('[jobs categories=".get_query_var("job_listing_category').' show_filters="true"]'); ?>
</article>
</div>
<?php get_sidebar(); ?>
<?php get_footer(); ?>