diff --git a/src/i18n/messages/en.json b/src/i18n/messages/en.json
index 1d5303a850..18234c882d 100644
--- a/src/i18n/messages/en.json
+++ b/src/i18n/messages/en.json
@@ -5681,7 +5681,24 @@
     "advancedCompressionSubtitle": "Estimate token savings across different compression modes.",
     "monitorOriginHint": "Events generated by Translate or the main pipeline appear here in real time.",
     "monitorEmptyCta": "Go to the Translate tab and send a request — it will appear here.",
-    "monitorOpenTranslateButton": "Go to Translate"
+    "monitorOpenTranslateButton": "Go to Translate",
+    "pipelineStepClientRequest": "Client Request",
+    "pipelineStepClientRequestDesc": "Request received in client format",
+    "pipelineStepFormatDetected": "Format Detected",
+    "pipelineStepFormatDetectedDesc": "Auto-detected source format",
+    "pipelineStepOpenAIIntermediate": "OpenAI Intermediate",
+    "pipelineStepOpenAIIntermediateDesc": "Translated to OpenAI hub format",
+    "pipelineStepProviderFormat": "Provider Format",
+    "pipelineStepProviderFormatDesc": "Translated to provider target format",
+    "pipelineStepProviderResponse": "Provider Response",
+    "pipelineStepProviderResponseDesc": "Streaming response from provider",
+    "conceptDiagramArrow1": "speaks",
+    "conceptDiagramArrow2": "translates",
+    "conceptDiagramArrow3": "converts",
+    "conceptDiagramExampleHub": "OpenAI",
+    "conceptDiagramHubTooltip": "Intermediate hub used by the translator to convert between formats that don't have a direct mapping.",
+    "conceptDiagramSourceTooltip": "The API format your app speaks (e.g., Anthropic SDK = claude).",
+    "conceptDiagramTargetTooltip": "The provider where the request will actually be sent."
   },
   "usage": {
     "title": "Usage",
diff --git a/src/i18n/messages/pt-BR.json b/src/i18n/messages/pt-BR.json
index 77515b587c..f34537cc45 100644
--- a/src/i18n/messages/pt-BR.json
+++ b/src/i18n/messages/pt-BR.json
@@ -5671,7 +5671,24 @@
     "advancedCompressionSubtitle": "Estime economia de tokens em diferentes modos.",
     "monitorOriginHint": "Eventos gerados pelo Translate ou pelo pipeline principal aparecem aqui em tempo real.",
     "monitorEmptyCta": "Volte para a aba Translate e envie um request — ele aparecerá aqui.",
-    "monitorOpenTranslateButton": "Ir para Translate"
+    "monitorOpenTranslateButton": "Ir para Translate",
+    "pipelineStepClientRequest": "Requisição do Cliente",
+    "pipelineStepClientRequestDesc": "Requisição recebida no formato do cliente",
+    "pipelineStepFormatDetected": "Formato Detectado",
+    "pipelineStepFormatDetectedDesc": "Formato de origem detectado automaticamente",
+    "pipelineStepOpenAIIntermediate": "Intermediário OpenAI",
+    "pipelineStepOpenAIIntermediateDesc": "Traduzido para o formato hub OpenAI",
+    "pipelineStepProviderFormat": "Formato do Provider",
+    "pipelineStepProviderFormatDesc": "Traduzido para o formato do provider de destino",
+    "pipelineStepProviderResponse": "Resposta do Provider",
+    "pipelineStepProviderResponseDesc": "Resposta em streaming do provider",
+    "conceptDiagramArrow1": "fala",
+    "conceptDiagramArrow2": "traduz",
+    "conceptDiagramArrow3": "converte",
+    "conceptDiagramExampleHub": "OpenAI",
+    "conceptDiagramHubTooltip": "Hub intermediário usado pelo translator para converter entre formatos que não têm mapeamento direto.",
+    "conceptDiagramSourceTooltip": "O formato de API que sua app fala (ex: SDK Anthropic = claude).",
+    "conceptDiagramTargetTooltip": "O provider para onde a requisição será realmente enviada."
   },
   "usage": {
     "title": "Uso",
diff --git a/tests/unit/translator-friendly-i18n-keys.test.ts b/tests/unit/translator-friendly-i18n-keys.test.ts
index b13abe12f7..712acd44f9 100644
--- a/tests/unit/translator-friendly-i18n-keys.test.ts
+++ b/tests/unit/translator-friendly-i18n-keys.test.ts
@@ -85,6 +85,25 @@ const NEW_KEYS = [
   "monitorOriginHint",
   "monitorEmptyCta",
   "monitorOpenTranslateButton",
+  // Pipeline step keys (GAP-NOVO-1)
+  "pipelineStepClientRequest",
+  "pipelineStepClientRequestDesc",
+  "pipelineStepFormatDetected",
+  "pipelineStepFormatDetectedDesc",
+  "pipelineStepOpenAIIntermediate",
+  "pipelineStepOpenAIIntermediateDesc",
+  "pipelineStepProviderFormat",
+  "pipelineStepProviderFormatDesc",
+  "pipelineStepProviderResponse",
+  "pipelineStepProviderResponseDesc",
+  // Concept diagram keys (GAP-NOVO-1)
+  "conceptDiagramArrow1",
+  "conceptDiagramArrow2",
+  "conceptDiagramArrow3",
+  "conceptDiagramExampleHub",
+  "conceptDiagramHubTooltip",
+  "conceptDiagramSourceTooltip",
+  "conceptDiagramTargetTooltip",
 ] as const;
 
 // ─── Keys that should obviously differ from English (spot check) ──────────────