Multiple bug fixes

【Contents of the fix】
■【iPhoneFixed an issue where the Hatena bookmark icon was not displayed on the share button in the fixed footer bar.
■SSL support for Google Custom Search widget.
■Fixed a bug in the display of Mega Menu A and Footer Blog on the Welcart registration and login pages.

The following are the files that have been modified for this update.

【Modified file】
css/footer-bar.css
functions/update-notifier.php
header.php
languages/ja.mo
languages/ja.po
style.css
template-parts/footer-bar.php
template-parts/footer-blog.php
widget/google-search.php

【Added files】
img/hatenabookmark-logomark.svg

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