Breadcrumb list optimization/custom script function added

【Contents of modification】
■Optimization of breadcrumbs list
■Added custom script function in the theme option basic setting.

The following files have been modified for this update.
【Fixed files】
admin/inc/basic.php
admin/theme-options.php
functions/head.php
languages/ja.mo
languages/ja.po
style.css
template-parts/breadcrumb.php

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