Multiple bug fixes

【Contents of the fix】
■Changed the specification of the link function of the header slider.
 ・When there is no link destination setting, the button will not be displayed.
 ・If there is a link setting, and there is a button, only the button will be linked; if there is no button, the entire slide will be linked.
■Fixed a bug that some buttons are not displayed when set to “Button Type 5 (Official Button)” in the social button display settings.
■Fixed a bug in the slider that it would not play automatically when a video was set.
■Fixed a bug that the footer logo and SNS button would not be displayed if the company information in the footer was left blank.
■Fixed an issue where meta title and meta description could not be set in the custom post “Production Results”.
■Fixed a bug where some theme options were automatically translated from English to Japanese (e.g. “Blog” to “Blog”).
■Fixed a bug where the footer would have a blank space when the fixed footer bar for smartphones is not displayed.
■SSL support for Google custom search widget.
■Adjusted the style of the category list widget.
■Changed some widget descriptions.

The following files have been modified for this update.
【Modified files】
admin/theme-options.php
functions/head.php
functions/seo.php
languages/ja.mo
languages/ja.po
widget/ad.php
widget/archive_dropdown.php
widget/category_list.php
widget/google_search.php
widget/styled_post_list1.php
widget/tab_post_list.php
widget/work_list.php
footer.php
functions.php
header.php
sns-btn-btm.php
sns-btn-top.php
style.css

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