Multiple bug fixes

【Contents of the fix】
■Corrected the application of the h1 tag.
■Updated page builder.
・【Firefox、IE】Fixed a bug that caused unstable display of Google map.
・Fixed the bug of switching editor and adjusted CSS in WordPress 5.5.
・Fixed a bug that the checkbox of the block border was removed when duplicating a block.
・Fixed other minor bugs.

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

【Modified file】
admin/css/my_admin.css
archive-work.php
functions/head.php
index.php
languages/ja.mo
languages/ja.po
page-design1.php
page-design2.php
page-design3.php
page.php
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
taxonomy-area.php
taxonomy-landmark.php