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docs: ko: installation.mdx

* Adds Mask2Former to transformers
Co-authored-by: Shivalika Singh <shivalikasingh95@gmail.com>
Co-authored-by: Shivalika Singh <73357305+shivalikasingh95@users.noreply.github.com>
Co-authored-by: NielsRogge <48327001+NielsRogge@users.noreply.github.com>
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* docs: fix: set overflowing image width to auto-scale

* docs: fix: new language Korean is also affected

* docs: fix: unnecessary line break in index page

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