Fixed multiple bugs

【Contents of the fix】
■Fixed an error when changing theme option settings.
■Fixed an error that appears only in debug mode.
■Fixed an error when changing theme options settings.
■Fixed duplicate site names being displayed in the browser title tag.
■Changed to display Facebook and Twitter links in a separate window on the left side.
■Implemented comments and trackbacks.
■Implemented blinking arrows on both sides of the header menu when viewed on a smartphone.

The following are the files that have been modified for this update.
【Added files】
comment-style.css

【Modified files】
admin/theme-options.php
functions/seo.php
languages/ja.mo
languages/ja.po
js/jscript.js
functions.php
header.php
comments.php
content-single.php
focus.css
sidebar.php
style.css

For more information, please visit the FOCUS (tcd030) download site for purchasers.