post_title_ml property should be used to get a raw post value, instead of post_title
$title = $post->post_title_ml
To translate raw value translate_text filter can be used
$english_title = apply_filters('translate_text', $title, 'en');
Or qtranxf_use_language() function
$english_title = qtranxf_use_language('en', $title, false, true);