Support for deepl.com

[mipapo]

deepl.com is a great translator (not for all languages, but the quality is really perfect)

https://github.com/chriskonnertz/DeepLy

[bocharsky-bw]

Hey @mipapo! Thank you for this suggestion! I see DeepLy supports a limit set of languages and they have only paid plans, though it's a matter of taste probably. Any contributions are always welcome, so if anybody is interested in this service - please, pick this issue and implement the integration. We would be happy to merge it 👍