Multiple bug fixes

【Contents of the fix】
■OGP tag optimization
■Changed Facebook OGP setting from old specification (fb:admins) to new specification (fb:app_id).
※Please refer to the following article about how to get “fb:app_id” (application ID).
 How to get the fb:app ID required for Facebook OGP settings
■【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.
■Page builder has been updated.
・【Firefox、IE】Fixed the problem of Google map display instability.
・Fixed the problem of switching editors 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-02.css
functions/head.php
functions/ogp.php
functions/seo.php
functions/update_notifier.php
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
widget/google_search.php