chore: Update and align error message (#5319)

# Description
<!-- Please include a summary of the changes and the related issue.
Please also include relevant motivation and context. List any
dependencies that are required for this change. -->



**Type of change**
<!-- Please delete options that are not relevant. Remember to title the
PR according to the type of change -->

- Improvement (change adding some improvement to an existing
functionality)

**How Has This Been Tested**
<!-- Please add some reference about how your feature has been tested.
-->

**Checklist**
<!-- Please go over the list and make sure you've taken everything into
account -->

- I added relevant documentation
- I followed the style guidelines of this project
- I did a self-review of my code
- I made corresponding changes to the documentation
- I confirm My changes generate no new warnings
- I have added tests that prove my fix is effective or that my feature
works
- I have added relevant notes to the CHANGELOG.md file (See
https://keepachangelog.com/)

argilla-frontend/translation/de.js

@@ -224,6 +224,10 @@ export default {
       missing_vector: {
         message: "Vektor nicht im ausgewählten Datensatz gefunden",
       },
+      update_distribution_with_existing_responses: {
+        message:
+          "Die Verteilungseinstellungen können für einen Datensatz mit Benutzerantworten nicht geändert werden",
+      },
     },
     http: {
       401: {

argilla-frontend/translation/en.js

@@ -238,7 +238,7 @@ export default {
       },
       update_distribution_with_existing_responses: {
         message:
-          "This dataset has responses. Task distribution settings cannot be modified",
+          "Distribution settings can't be modified for a dataset containing user responses",
       },
     },
     http: {

argilla-server/src/argilla_server/validators/datasets.py

@@ -50,5 +50,5 @@ async def validate(cls, db: AsyncSession, dataset: Dataset, dataset_attrs: dict)
     async def _validate_distribution(cls, dataset: Dataset, dataset_attrs: dict) -> None:
         if dataset_attrs.get("distribution") is not None and (await dataset.responses_count) > 0:
             raise UpdateDistributionWithExistingResponsesError(
-                "Distribution settings cannot be modified for a dataset with records including responses"
+                "Distribution settings can't be modified for a dataset containing user responses"
             )

argilla-server/tests/unit/api/handlers/v1/datasets/test_update_dataset.py

@@ -142,7 +142,7 @@ async def test_update_dataset_distribution_for_dataset_with_responses(
 
         assert response.json() == {
             "code": "update_distribution_with_existing_responses",
-            "message": "Distribution settings cannot be modified for a dataset with records including responses",
+            "message": "Distribution settings can't be modified for a dataset containing user responses",
         }
 
     async def test_update_dataset_distribution_with_invalid_strategy(