Support for multiple bugs

【Contents of the fixes】
■Updated page builder (for WordPress 5.5)
■Fixed a bug that Mega Menu B (About Us) is not displayed when permalink is set to “Basic”.
■【IE11】Support for displaying the logo when it is set to “Use Text”.
(In order to deal with the bug in IE11, the font specification is changed to be ineffective only when browsing IE11.

The following files have been modified for this update.
【Modified file】
inc/menu.php
inc/update_notifier.php
languages/ja.mo
languages/ja.po
pagebuilder/assets/admin/css/admin.css
pagebuilder/assets/admin/js/admin.js
pagebuilder/assets/admin/js/editor.js
pagebuilder/assets/admin/js/repeater.js
pagebuilder/assets/admin/js/slider.js
pagebuilder/assets/css/simple_table_3column.css
pagebuilder/modules/googlemap.php
pagebuilder/modules/slider.php
pagebuilder/modules/tab.php
pagebuilder/pagebuilder.php
style.css

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