Multiple bug fixes

【Contents of the fix】
■Fixed a bug that HTML tags are output as-is when HTML tags are entered in [A] of fixed page templates 2 and 3.
■Fixed a bug that imported settings are not reflected in the theme options management.

The following files have been modified for this update.

【Modified files】
admin/theme-options.php
comments.php
languages/ja.mo
languages/ja.po
style.css
template-parts/page-type3.php
template-parts/page-type4.php