Fixed to optimize color settings

【Contents of modification】
■Added a setting field so that the button color can be set individually.
■Corrected the application range of color settings in areas where optional settings were not possible.
・The date of the “News Ticker” on the top page
(→Sub color 2 applied)
・Slider navigation links on the top page “Showcase” and “Gallery Contents
(→Sub color 2 applied)
・Slider navigation links in footer “Blog contents”
(→Sub color 2 applied)

The following files have been modified to reflect this update.
【Corrected files】
admin/css/my_admin.css
admin/css/my_admin.min.css
admin/inc/top.php
admin/inc/top.php ・admin/theme-options.php
functions/head.php
languages/ja.mo
languages/ja.po
style.css

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