chore: complete google-cloud-translate migration (#16683)

The only change required is in the post-processing script, due to
running against existing code.

Fixes googleapis/librarian#5335

Author: jskeet

.librarian/generator-input/client-post-processing/integrate-isolated-handwritten-code.yaml

@@ -97,14 +97,22 @@ replacements:
           translate_v3/services_
           translate_v3/types_
 
+      API Reference
+      -------------
+      .. toctree::
+          :maxdepth: 2
+
+          translate_v2/services_
+          translate_v2/types_
+    
       API Reference
       -------------
       .. toctree::
           :maxdepth: 2
 
           translate_v3beta1/services_
           translate_v3beta1/types_
-    
+
     after: |
       API Reference
       -------------

librarian.yaml

@@ -3757,7 +3757,6 @@ libraries:
       - tests/unit/v2
       - tests/unit/v2/test__http.py
       - tests/unit/v2/test_client.py
-    skip_generate: true
     python:
       library_type: GAPIC_COMBO
       opt_args_by_api:

packages/google-cloud-translate/.repo-metadata.json

@@ -1,17 +1,16 @@
 {
-  "api_description": "can dynamically translate text between thousands of language pairs. Translation lets websites and programs programmatically integrate with the translation service.",
-  "api_id": "translate.googleapis.com",
-  "api_shortname": "translate",
-  "client_documentation": "https://cloud.google.com/python/docs/reference/translate/latest",
-  "default_version": "v3",
-  "distribution_name": "google-cloud-translate",
-  "issue_tracker": "https://issuetracker.google.com/savedsearches/559749",
-  "language": "python",
-  "library_type": "GAPIC_COMBO",
-  "name": "translate",
-  "name_pretty": "Cloud Translation",
-  "product_documentation": "https://cloud.google.com/translate/docs/",
-  "release_level": "stable",
-  "repo": "googleapis/google-cloud-python",
-  "requires_billing": true
+    "api_description": "can dynamically translate text between thousands of language pairs. Translation lets websites and programs programmatically integrate with the translation service.",
+    "api_id": "translate.googleapis.com",
+    "api_shortname": "translate",
+    "client_documentation": "https://cloud.google.com/python/docs/reference/translate/latest",
+    "default_version": "v3",
+    "distribution_name": "google-cloud-translate",
+    "issue_tracker": "https://issuetracker.google.com/savedsearches/559749",
+    "language": "python",
+    "library_type": "GAPIC_COMBO",
+    "name": "translate",
+    "name_pretty": "Cloud Translation",
+    "product_documentation": "https://cloud.google.com/translate/docs/",
+    "release_level": "stable",
+    "repo": "googleapis/google-cloud-python"
 }