diff --git a/backend/testjam/services/integration_service.py b/backend/testjam/services/integration_service.py
index 9a7256b..30df378 100644
--- a/backend/testjam/services/integration_service.py
+++ b/backend/testjam/services/integration_service.py
@@ -50,6 +50,20 @@ def create_integration(
     ensure_encryption_available()
     provider = _provider_or_400(provider_key)
     validated_config = _validate_provider_config(provider, config)
+    existing = (
+        db.query(ProjectIntegration)
+        .filter(
+            ProjectIntegration.project_id == project_id,
+            ProjectIntegration.provider == provider.key,
+            ProjectIntegration.name == name,
+        )
+        .first()
+    )
+    if existing:
+        raise HTTPException(
+            status_code=409,
+            detail=f"Integration '{name}' for provider '{provider.key}' already exists",
+        )
     integration = ProjectIntegration(
         project_id=project_id,
         provider=provider.key,
diff --git a/frontend/src/i18n/locales/es/cases.json b/frontend/src/i18n/locales/es/cases.json
index 2cd1227..af72d84 100644
--- a/frontend/src/i18n/locales/es/cases.json
+++ b/frontend/src/i18n/locales/es/cases.json
@@ -21,7 +21,7 @@
   "stepSaved": "Paso guardado",
   "stepExpected": "Resultado esperado",
   "stepLabel": "Paso",
-  "stepExpectedInline": "Esperado:",
+  "stepExpectedInline": "Resultado esperado:",
   "context": {
     "about": "Información",
     "project": "Proyecto",
diff --git a/frontend/src/i18n/locales/es/executions.json b/frontend/src/i18n/locales/es/executions.json
index 8083703..6a2b482 100644
--- a/frontend/src/i18n/locales/es/executions.json
+++ b/frontend/src/i18n/locales/es/executions.json
@@ -158,7 +158,7 @@
       }
     },
     "step": {
-      "expected": "Esperado:",
+      "expected": "Resultado esperado:",
       "saving": "Guardando…",
       "save": "Guardar",
       "cancel": "Cancelar",