Fixed bugs/resize measures

■【iPhone】Fixed a bug that the Hatena bookmark icon was not displayed on the share button of the fixed footer bar.
■Adjusted the global menu display specification when the window is resized.

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

【Modified files】
assets/css/footer-bar.css
assets/css/footer-bar.min.css
inc/footer-bar.php
inc/update_notifier.php
inc/widgets/google_search.php
languages/ja.mo
languages/ja.po
style.css

【Added files】
assets/images/hatenabookmark-logomark.svg