Add option for multiple Deepl glossaries

[severinkilchhofer]

Since it's only possible to specify one glossary per language in the Deepl API, it would be great to be able to specify multiple glossary IDs in the plugin. Would it be possible to add this functionality?

https://support.deepl.com/hc/en-us/articles/4405021321746-Managing-glossaries-with-the-DeepL-API
-> You can create glossaries for any combination of these languages. Your API glossary should include only one language combination (e.g., English into German).

[Siilwyn]

Sounds good! We're open to a pull request. 👌