Regarding 1), read the pie-fight that was conducted over the issue (in chronological order; this was in January 2006):

• ET Non-English Census
  
• Les Français sont-ils nuls en anglais, Yes or No?
  
• the language issue at ET: a dissenting view
  
• ET Language Census Analysis

The general conclusion (at least in my mind) was that

• we don't really want language-separated sections as that leads to fragmentation,
  
• we aren't quite prepared to go multilingual given the low number of speakers of each non-English language among active commenters/diarists,
  
• but if someone wants to, they can just go ahead posting in another language, but it is good to include a short English summary up front,
  
• those speaking the language of a non-English diary should be helpful in translating/summarising to non-speakers or weak speakers of that language.

_{*Lunatic*, n.
One whose delusions are out of fashion.}