Feature/paired item support (#3869)

* Add paired item helper and implement it in some nodes

packages/nodes-base/nodes/DeepL/DeepL.node.ts

@@ -7,6 +7,7 @@ import {
 	INodePropertyOptions,
 	INodeType,
 	INodeTypeDescription,
+	NodeExecutionWithMetadata,
 } from 'n8n-workflow';
 
 import { deepLApiRequest } from './GenericFunctions';
@@ -108,14 +109,13 @@ export class DeepL implements INodeType {
 		const items = this.getInputData();
 		const length = items.length;
 
-		const responseData = [];
+		const responseData: INodeExecutionData[] = [];
 
 		for (let i = 0; i < length; i++) {
 			try {
 				const resource = this.getNodeParameter('resource', i) as string;
 				const operation = this.getNodeParameter('operation', i) as string;
 				const additionalFields = this.getNodeParameter('additionalFields', i) as IDataObject;
-
 				if (resource === 'language') {
 					if (operation === 'translate') {
 						let body: IDataObject = {};
@@ -129,19 +129,30 @@ export class DeepL implements INodeType {
 								: additionalFields.sourceLang;
 						}
 
-						const response = await deepLApiRequest.call(this, 'GET', '/translate', body);
-						responseData.push(response.translations[0]);
+						const { translations } = await deepLApiRequest.call(this, 'GET', '/translate', body);
+						const [translation] = translations;
+						const translationJsonArray = this.helpers.returnJsonArray(translation);
+						const executionData = this.helpers.constructExecutionMetaData(
+							translationJsonArray,
+							{ itemData: { item: i } },
+							);
+						responseData.push(...executionData);
 					}
 				}
 			} catch (error) {
 				if (this.continueOnFail()) {
-					responseData.push({ $error: error, $json: this.getInputData(i) });
+					const executionErrorData = {
+						json: {} as IDataObject,
+						error: error.message,
+						itemIndex: i,
+					};
+					responseData.push(executionErrorData as INodeExecutionData);
 					continue;
 				}
 				throw error;
 			}
 		}
 
-		return [this.helpers.returnJsonArray(responseData)];
+		return [responseData];
 	}
 }