Fixed multiple bugs and improved narrowed search function

【Contents of correction】
■Added a setting item for narrowed search by tags (supports collapsing the narrowed selection point).
■Fixed a bug where the slide animation did not work when hovering after the 15th article on the introduction page archive page.
■Fixed a bug that “Shoulder Copy”, “Introduction Page Slider”, and “Slider Switching Speed” did not work when the slug of the introduction page was changed.
■Fixed a bug related to responsive in IE11.
■Updated translation files.
■Fixed the code (sns-btn-btm.php/sns-btn-top.php)

The files that have been modified for this update are as follows
【Corrected files】
・admin/theme-options.php
・css/responsive.css
・fonts folder
・functions/introduce_cf.php
・functions/seo.php
・languages/ja.mo
・languages/ja.po
・js/jscript.js
・custom_search_results.php
・navigation2.php
・sns-btn-btm.php
・sns-btn-top.php
・style.css

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