Multilingual bibliography

[nrydanov]

Currently, there's no any support for language entry in CSL or BibLatex. This PR can add possibility to parse and use multiple languages in single bibliography, depending on the value of language parameter for each entry.

[nrydanov]

Hello anyone?...

[nrydanov]

Thanks for your answer!

I will study your investigation and reply a little bit later. Currently, I definitely have poor domain knowledge.

[nrydanov]

Ok, I got it.

Well, I think that the best idea for now is to just add configuration option. Let me explain why:

1. First of all, the primary goal of this PR is to just add support for language entries.
2. I would consider thinking about big changes in project only if
   • it's clear that those changes would make things much better
   • here's enough time and resources to do it
   • when a person, who realize this feature, completely understand what he does

I wouldn't say that this situation matches at least one of this points, because

• you said that you personally "do not find CSL-M implementation the best" and there's no person in this project, who can judge it better
• I spend my free time doing this PR, so I'm not sure that I will be ready for such hard work, at least alone
• I need to do much more research in case we want to achieve smth bigger than small feature

Also, I find the idea of making configuration option as good one, because personally I didn't care of any CSL specs before this day and as end-user I don't care about it at all.

[nrydanov]

I'll also review changes in formatting and revert them. Still can't understand why do we have different formatting rules ;)

I'll also squash commits when PR is done.

[reknih]

Sounds good. I'll review the change once it hits this PR.