common/s*: add and update Korean translation (#14666)

* common/s*: add and update Korean translation

* scamper: fix typo

* Update pages.ko/common/simplehttpserver.md

Co-authored-by: Chooooo <contact@choo.ooo>

* Update pages.ko/common/steamcmd.md

Co-authored-by: Chooooo <contact@choo.ooo>

---------

Co-authored-by: Sebastiaan Speck <shem.speck@gmail.com>
Co-authored-by: Chooooo <contact@choo.ooo>

pages.ko/common/subliminal.md

@@ -0,0 +1,8 @@
+# subliminal
+
+> Python 기반 자막 다운로드 도구.
+> 더 많은 정보: <https://github.com/Diaoul/subliminal>.
+
+- 비디오에 대한 영어 자막 다운로드:
+
+`subliminal download -l {{en}} {{비디오.확장자}}`