Fixed bugs/added functions

【Contents of the fix】
■Fixed a bug that the title of the header of the top page “Recommended Plan Contents” could not break the line.
■Added custom script function.

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