Multiple bug fixes

【Contents of the fixes】
■Changed specifications so that the style of the article body is applied even in the top page free space.
■Fixed an error regarding the login judgment in the comment section.
■Corresponded to the specification change of the social button type 5 (official button) “Facebook Like Button”.
■Removed “Google+” from the settings of social buttons that are no longer in service.
■Fixed a bug in the top page hero header behavior when displayed on a smartphone.
(This was occurring when only “Show splash page in PC view” was checked in Theme Options > Top Page > Splash Page settings.)
■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
■OGP tag optimization
■【Mac】Fixed a bug that Japanese and European characters may be displayed with different thickness when using some fonts.

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

【Modified file】
admin/css/editor-style-02.css
admin/css/editor-style-02.min.css
admin/inc/basic.php
comments.php
functions.php
inc/head.php
inc/ogp.php
inc/seo.php
languages/ja.mo
languages/ja.po
pagebuilder/assets/css/pagebuilder.css
style.css
template-parts/contents-builder.php
template-parts/sns-btn-btm.php
template-parts/sns-btn-top.php