Fetaure Request: Add the possibility to pass the language to get_section

[ogarcia]

For example, right now to get a section you call get_section(path="blog/_index.md") but that brings up the section with the default language. It would be very interesting if you could do get_section(path="blog/_index.md", lang=lang).

I've been looking for ways to get around this but I can't think of any other. Because adding the language in a way similar to this will fail with the default language that has no code:

get_section(path=["blog/_index", lang, "md" | join(sep=".")])

[SumDonkuS]

If this is of interest, I think I can put something together for the optional lang argument. Looks like there was some conversation over here, but not sure if it was ever decided upon.

[Keats]

You can do a PR, I don't think this is controversial