Add i18n support for Korean (#487)

* feat(i18n): Add Korean translation

* Add Korean translation (based on English version)

Signed-off-by: JaeSang Yoo <jsyoo5b@gmail.com>

* chore: Append contributor list

Signed-off-by: JaeSang Yoo <jsyoo5b@gmail.com>

CONTRIBUTORS.md

@@ -87,3 +87,4 @@
 - [TMineCola](https://github.com/tminecola)
 - [Arafat Hasan](https://github.com/arafat-hasan)
 - [YUJI](https://yuji.ne.jp/)
+- [JaeSang Yoo](https://github.com/JSYoo5B)

i18n/ko.toml

@@ -0,0 +1,33 @@
+[category]
+other = "카테고리"
+
+[tag]
+other = "태그"
+
+[series]
+other = "시리즈"
+
+[author]
+other = "저자"
+
+[posts]
+other = "포스트"
+
+[reading_time]
+one = "읽는데 1분"
+other = "읽는데 {{ .Count }}분"
+
+[page_not_found]
+other = "페이지를 찾을 수 없습니다."
+
+[page_does_not_exist]
+other = "해당 페이지가 존재하지 않습니다."
+
+[head_back]
+other = "<a href=\"{{ . }}\">홈페이지</a>로 돌아가기"
+
+[powered_by]
+other = "Powered by"
+
+[see_also]
+other = "관련 글:"