Add multilanguage support

[Fale]

A huge part of the population (me included) is not an English native speaker and therefore tends to blog in two (or more) languages. I think it would be awesome for Shonku to support this kind of usage. I think the main features to be developed to have this function are:

• PRE-PUBLISH: be able to mark the single posts with a specific language
• FRONTEND: be able to show only the posts of a single language (ie: only english posts by default) in each category/home page
• FRONTEND: be able to move from a post/page to each translated version of it (possibly with a button/image/link).

The two main approaches could be:

• Each post file has the different languages in it
• Each post/language combination has it's own file but has the reference to all the other languages of the same post

[kushaldas]

Thanks for the feature request. I will update this ticket about the approach and then we can add that feature. I never tried to implement as I was waiting for someone to ask for it :) :+1: