Multiple bug fixes and feature additions

【Contents of fixes】
■Fixed error messages displayed on the top page.
■Added Google custom search widget.
■Adjusted the position of category icons.
■Changed so that you can set recommended articles in quick edit.

The following files have been modified for this update.
【Fixed files】
languages/en.mo
languages/en.po
functions.php
style.css
style_pc.css
style_sp.css

【Added files】
functions/quick_edit.php
widget/google_search.php

For more information, please visit the Chill(tcd016) download site for purchasers.

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