docs(API): Clarify the user field on translation schema

Author: jablan

doc/compiled.json

@@ -2285,6 +2285,7 @@
             "title": "translation_details",
             "properties": {
               "user": {
+                "description": "The user who last updated the translation content",
                 "$ref": "#/components/schemas/user_preview"
               },
               "word_count": {

schemas/translation_details.yaml

@@ -6,6 +6,7 @@ translation_details:
     title: translation_details
     properties:
       user:
+        description: The user who last updated the translation content
         "$ref": "./user_preview.yaml#/user_preview"
       word_count:
         type: integer