✨ Add DeepL Node (#1551)

* Created the node for DeepL translator tool

Still missing a few additional fields but functionality is ok for most cases.

* Added optional fields for Deepl and separated description to a separate file

* Fixed linting issue

* 🎨 Replace PNG with SVG icon

* 💄 Adjust style to codebase conventions

* 🔨 Refactor types

* ⚡ Simplify error handling

* ⚡ Add always open edit window for text field

* ✏️ Edit descriptions in text operations

* ⚡ Fix source language for English

EN-GB and EN-US are not supported as source languages, but EN is.

* 💄 Apply cosmetic changes

* ⚡ Small improvement

* ⚡ Remove not needed Authentication selection

Co-authored-by: Iván Ovejero <ivov.src@gmail.com>
Co-authored-by: ricardo <ricardoespinoza105@gmail.com>
Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>

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

@@ -0,0 +1,62 @@
+import {
+	OptionsWithUri,
+} from 'request';
+
+import {
+	IExecuteFunctions,
+	IExecuteSingleFunctions,
+	ILoadOptionsFunctions,
+} from 'n8n-core';
+
+import {
+	IDataObject,
+} from 'n8n-workflow';
+
+export async function deepLApiRequest(
+	this: IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions,
+	method: string,
+	resource: string,
+	body: IDataObject = {},
+	qs: IDataObject = {},
+	uri?: string,
+	headers: IDataObject = {},
+) {
+
+	const options: OptionsWithUri = {
+		headers: {
+			'Content-Type': 'application/json',
+		},
+		method,
+		body,
+		qs,
+		uri: uri || `https://api.deepl.com/v2${resource}`,
+		json: true,
+	};
+
+	try {
+		if (Object.keys(headers).length !== 0) {
+			options.headers = Object.assign({}, options.headers, headers);
+		}
+
+		if (Object.keys(body).length === 0) {
+			delete options.body;
+		}
+
+		const credentials = this.getCredentials('deepLApi');
+
+		if (credentials === undefined) {
+			throw new Error('No credentials got returned!');
+		}
+
+		options.qs.auth_key = credentials.apiKey;
+
+		return await this.helpers.request!(options);
+
+	} catch (error) {
+		if (error?.response?.body?.message) {
+			// Try to return the error prettier
+			throw new Error(`DeepL error response [${error.statusCode}]: ${error.response.body.message}`);
+		}
+		throw error;
+	}
+}