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translate training doc to Korean

docs: feat: Korean pipeline_tutorial
Co-authored-by: Jungnerd <46880056+jungnerd@users.noreply.github.com>
Co-authored-by: Hyeonseo Yun <0525_hhgus@naver.com>
Co-authored-by: gabrielwithappy <102908949+gabrielwithappy@users.noreply.github.com>
Co-authored-by: Na Yeon Han <nayeon2.han@gmail.com>

translate the autoclass_tutorial and fix the typo of the quicktour

Co-authored-by: gabrielwithappy <102908949+gabrielwithappy@users.noreply.github.com>

docs: ko: sagemaker.mdx

docs: ko: quicktour page

review by @ArthurZucker
docs: fix: remove duplicate
Co-Authored-By: Arthur <48595927+ArthurZucker@users.noreply.github.com>
Co-authored-by: Arthur <48595927+ArthurZucker@users.noreply.github.com>

docs: ko: installation.mdx

docs: i18n: first draft of index page
docs: fix: first revision of index page
docs: i18n: missed section - supported frameworks
docs: fix: second revision of index page
review by @ArthurZucker

refactor: remove untranslated files from korean
docs: fix: remove untranslated references from toctree.yml
feat: enable korean docs in gh actions
docs: feat: add in_translation page as placeholder
docs: bug: testing if internal toc need alphabet chars
docs: fix: custom english anchor for non-alphanumeric headings
review by @sgugger

docs: i18n: translate comments on install methods in _config.py
docs: refactor: more concise wording for translations