Fixed a bug in the content builder and added a search exclusion function

【Contents of the fix】
■Fixed a bug that the category of the introduction page is not displayed in the “Carousel Slider” of the Content Builder when the slug of the introduction content is changed.
■Added “Exclude from search results” option to “Categories to exclude” in search form settings.

The following are the files that have been modified for this update.
【Corrected files】
・admin/contents_builder.php
・admin/theme-options.php
・functions/custom_search.php
・language/ja.po
・language/ja.mo
・style.css

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