Fixed bugs and adjusted notation in theme options

【Contents of the fix】
■Fixed a bug that the settings are not displayed when using the page builder when free space is selected in the footer free content settings.
■Adjusted the notation of “Display Settings” in the TCD theme options “Blog”.

The following are the files that have been modified for this update.
【Corrected files】
・admin/inc/blog.php
・template-parts/footer-cta.php
・language/ja.po
・language/ja.mo
・style.css