Fix zimit lang vs zim-lang confusion

dispatcher/backend/src/common/schemas/offliners/zimit.py

@@ -1,11 +1,10 @@
-from marshmallow import fields, validate
-
 from common.schemas import SerializableSchema, String, StringEnum
 from common.schemas.fields import (
     validate_output,
     validate_zim_description,
     validate_zim_filename,
 )
+from marshmallow import fields, validate
 
 # https://github.com/puppeteer/puppeteer/blob/main/src/common/DeviceDescriptors.ts
 # https://github.com/puppeteer/puppeteer/blob/
@@ -156,9 +155,17 @@ class Meta:
 
     lang = String(
         metadata={
-            "label": "Language",
-            "description": "ISO-639-3 (3 chars) language code of content. "
-            "If unspecified, will attempt to detect from main page, or use 'eng'",
+            "label": "Browser Language",
+            "description": "If set, sets the language used by the browser, should be"
+            "ISO 639 language[-country] code, e.g. `en` or `en-GB`",
+        }
+    )
+
+    zim_lang = String(
+        metadata={
+            "label": "ZIM Language",
+            "description": "Language metadata of ZIM (warc2zim --lang param). "
+            "ISO-639-3 code. Retrieved from homepage if found, fallback to `eng`",
         }
     )