Multiple bug fixes

【Contents of fixes】
■Optimized OGP tags.
■【Mac】Fixed a bug that the thickness of Japanese and European characters may be displayed differently when using some fonts.
■Fixed an error related to the login judgment in the comment section.
■Social Button Type 5 (Official Button) “Facebook Like Button” specification change.
■Removed “Google+” from the social button settings.
■【Chrome】Fixed a bug in the scrolling behavior of the top page.
■Page builder has been updated.
・【Firefox、IE】Fixed the problem of Google map display instability.
・Fixed the problem of switching editor and adjusted CSS in WordPress 5.5.
・Fixed other minor bugs.

The following files have been modified in this update.

【Modified file】
admin/theme-options.php
comments.php
editor-style-01.css
functions.php
functions/head.php
functions/ogp.php
functions/seo.php
japanese.css
languages/ja.mo
languages/ja.po
pagebuilder/assets/admin/css/admin.css
pagebuilder/assets/admin/js/admin.js
pagebuilder/assets/css/pagebuilder.css
pagebuilder/modules/googlemap.php
pagebuilder/modules/simple_table.php
pagebuilder/modules/slider.php
pagebuilder/pagebuilder.php
sns_btn_btm.php
sns_btn_top.php
style.css

【Added files】
fullpage.min.css
js/easings.min.js
js/fullpage.min.js