You need to have a copy of the define file in the base:
/includes/language/english/html_includes/define_editable_sidebox_content.php
before the copy in your custom template can be processed:
/includes/language/english/html_includes/AModernShopper/define_editable_sidebox_content.php
Since all the files are new, you could technically just put them all in the base. If you wanted to use this sidebox for various templates, you would need the files in the base, or else a complete set in each template folder (plus the define file in the base).
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