Fixed minor bugs/updated page builder

【Contents of the fix】
■Updated page builder (for WordPress 5.5)
■Minor description changes due to jQuery version upgrade

The following are the files that have been modified for this update.
【Modified file】
admin/js/cf-media-field.js
admin/js/my_script.js
admin/js/page_builder.js
functions/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/modules/googlemap.php
pagebuilder/modules/slider.php
pagebuilder/modules/tab.php
pagebuilder/pagebuilder.php
style.css

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