Added OGP setting function and adjusted display style

【Contents of modification】
■Added OGP setting function to theme options (Facebook/Twitter)
■Added the background color of the fixed page header to the main color application area.
■Adjusted the display style of widget titles.

The following are the files that have been modified for this update.
【Corrected files】
admin/theme-options.php
functions.php
functions/head.php
header.php
languages/ja.mo
languages/ja.po
style.css

The following files have been added for this update.
【Added files】
functions/ogp.php

For more information, please visit the MAG(tcd036) download site for purchasers.