Fixed multiple bugs

■【iPhone】Fixed a bug where the Hatena bookmark icon was not displayed on the share button in the fixed footer bar.
■Changed the specification of the pager for smartphones.

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

【Modified files】
css/footer-bar.css
footer-bar.php
functions/update_notifier.php
languages/ja.mo
languages/ja.po
mobile/navigation.php
mobile/style-mobile.css
style.css
widget/google_search.php

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