🌐 [i18n-KO] Translated main_classes/data_collator.md to Korean (#33954)

* docs: ko: main_classes/data_collator.md

* feat: nmt draft

* fix: resolve suggestions

Co-authored-by: SeongWooChoi <46990061+nuatmochoi@users.noreply.github.com>

* fix: resolve suggestions

---------

Co-authored-by: SeongWooChoi <46990061+nuatmochoi@users.noreply.github.com>
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

docs/source/ko/_toctree.yml

@@ -280,8 +280,8 @@
       title: (번역중) Callbacks
     - local: main_classes/configuration
       title: 구성
-    - local: in_translation
-      title: (번역중) Data Collator
+    - local: main_classes/data_collator
+      title: 데이터 콜레이터
     - local: main_classes/keras_callbacks
       title: 케라스 콜백
     - local: main_classes/logging