Use reference strings in Bsblan (#41049)

* Update strings.json

* Update config_flow.py

* Update test_config_flow.py

* Update strings.json

homeassistant/components/bsblan/config_flow.py

@@ -39,7 +39,7 @@ class BSBLanFlowHandler(ConfigFlow, domain=DOMAIN):
                 passkey=user_input.get(CONF_PASSKEY),
             )
         except BSBLanError:
-            return self._show_setup_form({"base": "connection_error"})
+            return self._show_setup_form({"base": "cannot_connect"})
 
         # Check if already configured
         await self.async_set_unique_id(info.device_identification)

homeassistant/components/bsblan/strings.json

@@ -14,10 +14,10 @@
       }
     },
     "error": {
-      "connection_error": "Failed to connect to BSB-Lan device."
+      "cannot_connect": "[%key:common::config_flow::error::cannot_connect%]"
     },
     "abort": {
-      "already_configured": "Device is already configured"
+      "already_configured": "[%key:common::config_flow::abort::already_configured_device%]"
     }
   }
-}
+}

tests/components/bsblan/test_config_flow.py

@@ -40,7 +40,7 @@ async def test_connection_error(
         data={CONF_HOST: "example.local", CONF_PASSKEY: "1234", CONF_PORT: 80},
     )
 
-    assert result["errors"] == {"base": "connection_error"}
+    assert result["errors"] == {"base": "cannot_connect"}
     assert result["step_id"] == "user"
     assert result["type"] == data_entry_flow.RESULT_TYPE_FORM