✨ 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/credentials/DeepLApi.credentials.ts

@@ -0,0 +1,15 @@
+import { ICredentialType, NodePropertyTypes } from 'n8n-workflow';
+
+export class DeepLApi implements ICredentialType {
+	name = 'deepLApi';
+	displayName = 'DeepL API';
+	documentationUrl = 'deepL';
+	properties = [
+		{
+			displayName: 'API Key',
+			name: 'apiKey',
+			type: 'string' as NodePropertyTypes,
+			default: '',
+		},
+	];
+}