Proposed minor spec changes, for comment.

[Sean Conner]

It was thus said that the Great solderpunk once stated:
> ISSUE 3:
> 
> Problem: There's no way to specify the (human) language a text/gemini document
> is written in.
> 
> Proposal: Define a new parameter for the text/gemini MIME type
> (alongside the previously defined `charset`) to specify language.
> Following the example set by HTML, it seems natural to call the
> parameter `lang` and to allow values as per RFC1766, e.g.:
> 
> text/gemini; charset=utf-8; lang=en
> text/gemini; charset=utf-8; lang=en-US
> text/gemini; charset=utf-8; lang=en-GB
> text/gemini; charset=utf-8; lang=es
> text/gemini; charset=utf-8; lang=fr

  What's a client to do if 'lang=' isn't there?  Assume English?  Assume
nothing?

  -spc