Multiple bug fixes

【Contents of fixes】
■Corrections to the wording of theme options, etc.
■Fixed a bug in the site search function so that contents created with Page Builder can be searched.
■Fixed a bug in which the preview did not work properly on pages using Page Builder.

The following files have been modified for this update.
【Fixed files】
admin/inc/basic.php
languages/ja.mo
languages/ja.po
pagebuilder/assets/admin/css/admin.css
pagebuilder/assets/css/googlemap.css
pagebuilder/assets/css/slider.css
pagebuilder/pagebuilder.php
style.css

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