Fixed bugs/added functions/updated page builder

【Contents of the fix】
■【macOS Big Sur】Fixed a bug that prevented the YouTube video in the top page header content from playing in the Chrome browser.
■Added custom script function.
(Appearance > TCD Theme Options > Basic Settings)
■Updated the page builder (for WordPress 5.5)
■Minor fixes (wording correction)

The following files have been modified for this update.
【Modified file】
admin/theme-options.php
css/jquery.mb.YTPlayer.min.css
functions/head.php
functions/update_notifier.php
js/jquery.mb.YTPlayer.min.js
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/modules/googlemap.php
pagebuilder/modules/slider.php
pagebuilder/modules/tab.php
pagebuilder/pagebuilder.php
style.css

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