diff --git a/homeassistant/components/assist_pipeline/pipeline.py b/homeassistant/components/assist_pipeline/pipeline.py
index faa1953cb94..cb00fe8852e 100644
--- a/homeassistant/components/assist_pipeline/pipeline.py
+++ b/homeassistant/components/assist_pipeline/pipeline.py
@@ -362,7 +362,7 @@ class PipelineRun:
                 code="stt-provider-unsupported-metadata",
                 message=(
                     f"Provider {stt_provider.name} does not support input speech "
-                    "to text metadata {metadata}"
+                    f"to text metadata {metadata}"
                 ),
             )
 
diff --git a/homeassistant/components/tts/__init__.py b/homeassistant/components/tts/__init__.py
index 7c9750c8c5c..6d667563ac9 100644
--- a/homeassistant/components/tts/__init__.py
+++ b/homeassistant/components/tts/__init__.py
@@ -488,7 +488,7 @@ class SpeechManager:
             or engine_instance.supported_languages is None
             or language not in engine_instance.supported_languages
         ):
-            raise HomeAssistantError(f"Not supported language {language}")
+            raise HomeAssistantError(f"Language '{language}' not supported")
 
         # Options
         if (default_options := engine_instance.default_options) and options: