Setup for Italian translation and add quicktour.mdx translation (#17472)

* Setup for Italian translation and add first document

- Add 'it' folder for files translated into Italian
- Add _config.py and _toctree.yml files
- Add translation of quicktour.mdx

* Fix style issue of italian documentation files

* Add 'it' to the languages section in the .github/workflows

* Remove - installation from _toctree for Italian

* Translation for index file

- Add index to _toctree.yml
- Add translation of index.mdx

* Fix typo in docs/source/it/index.mdx

* Translate code comments in docs/source/it/_config.py

Co-authored-by: Martina Fumanelli <[email protected]>

.github/workflows/build_documentation.yml

@@ -15,6 +15,6 @@ jobs:
       commit_sha: ${{ github.sha }}
       package: transformers
       notebook_folder: transformers_doc
-      languages: en es pt
+      languages: en es it pt
     secrets:
       token: ${{ secrets.HUGGINGFACE_PUSH }}

.github/workflows/build_pr_documentation.yml

@@ -14,4 +14,4 @@ jobs:
       commit_sha: ${{ github.event.pull_request.head.sha }}
       pr_number: ${{ github.event.number }}
       package: transformers
-      languages: en es pt
+      languages: en es it pt

docs/source/it/_config.py

@@ -0,0 +1,15 @@
+# docstyle-ignore
+INSTALL_CONTENT = """
+# Installazione di Transformers
+! pip install transformers datasets
+# Per installare dalla fonte invece dell'ultima versione rilasciata, commenta il comando sopra e
+# rimuovi la modalità commento al comando seguente.
+# ! pip install git+https://github.com/huggingface/transformers.git
+"""
+
+notebook_first_cells = [{"type": "code", "content": INSTALL_CONTENT}]
+black_avoid_patterns = {
+    "{processor_class}": "FakeProcessorClass",
+    "{model_class}": "FakeModelClass",
+    "{object_class}": "FakeObjectClass",
+}

docs/source/it/_toctree.yml

@@ -0,0 +1,6 @@
+- sections:
+  - local: index
+    title: 🤗 Transformers
+  - local: quicktour
+    title: Tour rapido
+  title: Iniziare