Minor specification changes and fixes/updated page builder

【Contents of correction】
■Corresponded to the specification change of the social button type 5 (official button) “Facebook Like Button”.
■Removed “Google+” which is no longer available from the social button settings.
■Page builder has been updated.
・【Firefox, IE】Fixed the problem of Google map display instability in Firefox and IE.
・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/inc/blog.php
languages/ja.mo
languages/ja.po
pagebuilder/assets/admin/css/admin.css
pagebuilder/assets/admin/js/admin.js
pagebuilder/modules/googlemap.php
pagebuilder/modules/simple_table.php
pagebuilder/modules/slider.php
pagebuilder/pagebuilder.php
style.css
template-parts/sns-btn-btm.php
template-parts/sns-btn-top.php