Added wording change function and multiple bug fixes

【Contents of fixes and additions】
■Added the ability to change the slug text of the custom post type “Announcement” as desired.
■Fixed a bug in which the meta title of the custom post type “Production Results” was displayed under the copyright notation (at the bottom of the page) on the iPhone.
■Fixed a bug in the post list screen when logging in to the admin screen from a smartphone.

The following files have been modified for this update.
【Corrected files】
admin/css/my_admin.css
admin/theme-options.php
functions.php
functions/seo.php
languages/ja.mo
languages/ja.po
style.css

For more information, please visit the download site for purchasers of UNIQUE (tcd044).