Added features/fixed multiple bugs

【Contents of fixes】
■Added the ability to display a “close button” to the header message function.
■Fixed the bug that the width of the free space cannot be selected in the content builder of the fixed page.
■Fixed the bug that the text color of “Catchphrase (Message Area)” in the top page “Message” content cannot be changed.

【Modified file】
admin/inc/front_page.php
admin/inc/front_page_mobile.php
admin/inc/header.php
css/responsive.css
front-page.php
functions/head.php
functions/page_access.php
functions/page_design1.php
functions/page_design2.php
functions/slider_ini.php
header.php
languages/default.mo
languages/default.po
languages/ja.mo
languages/ja.po
style.css
template-parts/breadcrumb.php

【Added files】
js/jquery.cookie.min.js

【Deleted files】
img/common/icon_search.png
img/common/icon_search2.png
img/common/loader.gif
img/common/loader2.gif

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