lnrpc: display transaction label in transaction details

lnrpc/rpc.proto

@@ -708,6 +708,9 @@ message Transaction {
 
     // The raw transaction hex.
     string raw_tx_hex = 9;
+
+    // A label that was optionally set on transaction broadcast.
+    string label = 10;
 }
 message GetTransactionsRequest {
     /*

lnrpc/rpc.swagger.json

@@ -4455,6 +4455,10 @@
         "raw_tx_hex": {
           "type": "string",
           "description": "The raw transaction hex."
+        },
+        "label": {
+          "type": "string",
+          "description": "A label that was optionally set on transaction broadcast."
         }
       }
     },

lnrpc/rpc_utils.go

@@ -36,6 +36,7 @@ func RPCTransactionDetails(txns []*lnwallet.TransactionDetail) *TransactionDetai
 			TotalFees:        tx.TotalFees,
 			DestAddresses:    destAddresses,
 			RawTxHex:         hex.EncodeToString(tx.RawTx),
+			Label:            tx.Label,
 		}
 	}
 

lnrpc/walletrpc/walletkit.swagger.json

@@ -93,6 +93,10 @@
         "raw_tx_hex": {
           "type": "string",
           "description": "The raw transaction hex."
+        },
+        "label": {
+          "type": "string",
+          "description": "A label that was optionally set on transaction broadcast."
         }
       }
     },

lnwallet/btcwallet/btcwallet.go

@@ -519,6 +519,7 @@ func minedTransactionsToDetails(
 			TotalFees:        int64(tx.Fee),
 			DestAddresses:    destAddresses,
 			RawTx:            tx.Transaction,
+			Label:            tx.Label,
 		}
 
 		balanceDelta, err := extractBalanceDelta(tx, wireTx)
@@ -564,6 +565,7 @@ func unminedTransactionsToDetail(
 		Timestamp:     summary.Timestamp,
 		DestAddresses: destAddresses,
 		RawTx:         summary.Transaction,
+		Label:         summary.Label,
 	}
 
 	balanceDelta, err := extractBalanceDelta(summary, wireTx)

lnwallet/interface.go

@@ -103,6 +103,9 @@ type TransactionDetail struct {
 
 	// RawTx returns the raw serialized transaction.
 	RawTx []byte
+
+	// Label is an optional transaction label.
+	Label string
 }
 
 // TransactionSubscription is an interface which describes an object capable of