Site dissapeared!

Hello,
i updated wordpress at 4.0 version. And in my categories menu the “Read More” link changed to some symbols and Read More.
Then i went to Theme Functions (functions.php) to edit the code.
I deleted the two udnerscores (__) in the code bellow and clicked update and the site dissapeared. The control panel dissapeared too! Any ideas to solve this?
This is the code (i placed the symbols i deleted between *** and *** so you can understand where it is):

function theme_get_content($args = array()) {
global $wp_query;
$post_id = get_queried_object_id();
$more_tag = theme_get_array_value($args, ‘more_tag’,***__***(‘Διαβ?στε περισσ?τερα <span class=”meta-nav”>→</span>’, THEME_NS));
if ($post_id && (is_single() || is_page()) && ‘false’ === get_post_meta($post_id, ‘use_wpautop’, true)) {
remove_filter( ‘the_content’, ‘wpautop’ );
}
theme_ob_start();
the_content($more_tag);
$content = theme_ob_get_clean();
return $content . wp_link_pages(array(
‘before’ => ‘<p><span class=”page-navi-outer page-navi-caption”><span class=”page-navi-inner”>’ . __(‘Pages’, THEME_NS) . ‘: </span></span>’,
‘after’ => ‘</p>’,
‘link_before’ => ‘<span class=”page-navi-outer”><span class=”page-navi-inner”>’,
‘link_after’ => ‘</span></span>’,
‘echo’ => 0
));
}

function theme_get_excerpt($args = array()) {
global $post;
$more_tag = theme_get_array_value($args, ‘more_tag’,***__***(‘Διαβ?στε περισσ?τερα <span class=”meta-nav”>→</span>’, THEME_NS));
$auto = theme_get_array_value($args, ‘auto’, theme_get_option(‘theme_metadata_excerpt_auto’));
$all_words = theme_get_array_value($args, ‘all_words’, theme_get_option(‘theme_metadata_excerpt_words’));
$min_remainder = theme_get_array_value($args, ‘min_remainder’, theme_get_option(‘theme_metadata_excerpt_min_remainder’));
$allowed_tags = theme_get_array_value($args, ‘allowed_tags’,
(theme_get_option(‘theme_metadata_excerpt_use_tag_filter’)
? explode(‘,’,str_replace(‘ ‘, ”, theme_get_option(‘theme_metadata_excerpt_allowed_tags’)))
: null));