[WIP] add dict support to back-cover to support any languages

[felixbd]

see: #19

Tasks:

• update back-cover func
• update docs
• test changes
• check for braking changes (maybe change back-cover implementation to keep it backwards compatible)

[felixbd]

maybe i move abstracts to the end of the func to be the last arg in back-cover ...

[maucejo]

I am not sure that it is worth to keep the backward compatibility, since, IMHO, it creates some inconsistencies in the API of the function. Provided that the back-cover function is properly documented in the manual, I think we can change the API of the function. What do you think about this statement?

[maucejo]

To close this PR, I propose to remove the backward compatibility. Do you agree @felixbd?

[felixbd]

@maucejo Yes, I agree. I'm in the middle of exams at the moment, but I can finish it off quickly at the beginning of next month. sorry for the delay

[maucejo]

Actually, I have integrated your PR by removing the backward compatibility. But I can let you finish if you wish. Good luck for your exams.