Add a license statement in the footer (#637)

mike

30.25.2022 720271a5bf72404ac60aa619ffdc7e4276952e8d

 i18n/ko.toml

@@ -30,6 +30,9 @@
[head_back]
other = "<a href=\"{{ . }}\">홈페이지</a>로 돌아가기"

[licensed_under]
other = "Licensed under"

[powered_by]
other = "Powered by"