Fixed bugs and theme option wording and added functionality

【Contents of fixes and feature additions】
■Fixed a bug that caused a Notice error to appear when updating WordPress.
■Changed the wording of theme options (“Theme Options” -> “TCD Theme Options”)
■Added OGP setting function to theme options (Facebook/Twitter).
■Updated quick tag content.

The following files have been modified to reflect this update.
【Corrected files】
admin/theme-options.php
functions.php
header.php
languages/en.mo
languages/en.po
style.css
【Added files】
functions/ogp.php

※In addition to the above, the quick tag configuration file has also been updated.
　Please download them from the download URL.

For more information, please visit the CUBEY (tcd023) download site for purchasers.

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