[Feat] Add glossary support for DeepL translation service

[michafaw]

Problem Statement

My team is using DeepL and would like to use at least two features that are available in DeepL Pro via their "translate text" API: formality and glossary_id. The API doc for that request is here. Currently, it appears that the only option I have in RemafoX is to set the API key for DeepL.

Suggested Solution

Add a text field within the DeepL section under Machine Translation -> API Keys to allow the user to set additional request parameters that will be passed to DeepL when making calls to their translate text API.

Additional Considerations

This would be for advanced use of RemafoX/DeepL, and bad/duplicate input could conflict with RemafoX's existing request parameters. Fixing #83 might be necessary to help users resolve syntax issues caused by these problems.

[Jeehut]

@michafaw Thank you for requesting this feature. I will consider adding a text field for additional options as requested.

[michafaw]

tl;dr - As originally suggested, a single text field for DeepL API parameters makes our use-case possible, but would not be as user-friendly as it could be.

Full post
After further research, it may not be as simple as the single text field I suggested. One of the two parameters we wish to pass is glossary_id, and each source<->target language pair has a different glossary. So the parameters would need to be per language.
There's ways to get around this by modifying the search paths in RemafoX to only include the source and one target language at a time, then set the appropriate parameter string, then trigger translation. The user would need to do this for each language they have a glossary.
Maybe a fuller solution would be instead of a single text field for all languages, there would be one text field for each target language RemafoX detects in the project.

[Jeehut]

@michafaw Thank you for the additional insight. It sounds like glossaries are a feature for themselves and probably need a more deeper integration into the RemafoX workflows, machine translation support only being one of them. But I think it makes sense to tackle them for RemafoX at some point.

[Jeehut]

@michafaw Just want to let you know that I just set the default formality of DeepL prefer_less which should result in informal translations. This matches the behavior of all other translation services and that of Apple in their operating systems, thus I believe this to be a better default. The change will ship with version 1.5.0 in a couple of days. You might want to consider re-translating some of your languages to convert them to the informal style.

I'm leaving this feature request open for the glossary support part that I will have a deeper look into at a later time.