Multiple bug fixes

【Contents of the fix】
■Minor fixes to support the jQuery version.
■【IE】【Firefox】Fixed the bug that the logo on the header content and the title of the fixed page are not displayed (compatible with the jQuery version upgrade)
■【iPhone】Fixed an issue where the Hatena bookmark icon was not displayed on the share button in the fixed footer bar.

The following files have been fixed for this update.

【Modified file】
admin/js/cf-media-field.js
admin/js/my_script.js
footer-bar/footer-bar.css
footer-bar/footer-bar.php
functions/head.php
functions/update_notifier.php
languages/ja.mo
languages/ja.po
style.css
widget/google_search.php

【Added files】
img/common/hatenabookmark-logomark.svg

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