SSL support / multiple bug fixes

【Contents of the fix】
■SSL support for “Google Custom Search” widget
■Fixed a bug in the display of Mega Menu B on the Welcart registration and login pages.
■Fixed the problem of “” at the end of image link URLs in related article card links.

The following files have been modified for this update.

【Modified files】
functions/card-link.php
header.php
languages/ja.mo
languages/ja.po
style.css
template-parts/footer-blog.php
widget/google-search.php

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