Multiple bug fixes

【Contents of the fix】
■Fixes to the specifications when “Footer Menu” is not set.
■Fixed a bug that social networking links of custom post type “Staff” will be opened in new tab.
■Fixed a bug that alternative images are not displayed on smartphones and tablets when the header content “Youtube” is set.
■Fixed the bug of AJAX saving in theme options in some environments.
■Fixed the bug of saving images in ad widget in some environments.
■Fixed a bug with the SNS button in the footer.
■Updated the theme option management function.
■Changed the specification of Facebook OGP function.
※It will be changed from fb:admins ID setting to fb:app ID setting.fb:app. Please refer to the following for information on how to obtain an ID.
https://tcd.cool/2018/01/facebook_app_id.html

The following files have been modified for this update.
【Corrected files】
・admin/assets/js/cf-media-field.js
・admin/assets/js/cf-media-field.min.js
・admin/assets/js/my_script.js
・admin/assets/js/my_script.min.js
・admin/inc/basic.php
・admin/theme-options.php
・inc/ogp.php
・template-parts/header-content.php
・languages/ja.mo
・languages/ja.po
・footer.php
・single-staff.php
・style.css

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