How to Order By Two Custom Fields?

You can try this by using meta query to filter results and then adding orderby to order results. Below arguments should work

$args = array(
 'post_type' => array('post', 'video'),
 'meta_key' => 'pp_like_count',
 'orderby'  => 'meta_value_num',
 "meta_query" => array(            
        array(
            "key" => "pp_lang",
            "value" => "english",
            "type" => "CHAR",
            "compare" => "="
        ),
    ),                 
);