Fixed theme option bug and fixed wording

【Contents of the fix】
■Fixed a bug that caused an error to be displayed when saving the settings in the theme options.
■Fixed a bug that caused an error when saving settings in the theme options.
(“Overlay” -> “Color over image”)

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

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