SSL support/Quick Tag description correction

■SSL support for “Google Custom Search” widget
■Fixed the description of quick tags “Heading H4” and “Heading H5”.

The following files have been modified for this update.

【Modified files】
admin/inc/front_page.php
functions/custom_editor.php
functions/update_notifier.php
languages/ja.mo
languages/ja.po
style.css
widget/google_search.php