1) English language. Probably a lot of people can read english and less can write. I can write in english even if I'm Italian but sometimes is not easy to write about souch difficult arguments as Constitution, law, religion or other. For me is a good training to improve my english but it requires a lot of time
On this side, have to tell you that @Richard Howell have been the first one speaking about the "linguistic barrier", which is a real problem.
I wonder if, instead of forcing asgardians to use English, the forum would be multilingual: that means to do, like I'm seeing many spanish motherlanguage are doing (their fault? I think not: they're correctly proud of their language), so to post each one into own motherlanguage and, who is interested into reading, just use a translator to have it readable. Maybe some kind of "justice"? ;-)
The alternative was to use an automatic translator to work on each post, basing on a per user "language setting"... but that requires money, as Google API is not given for free. But not to lose the hope, as Dr. Ashurbeyli is known to be "a billionaire" (even if I'm seeing very few money used on Asgardia).
4) People don't know existence of this forum. It's only the 11th menu item in Space Nation Menu. Probably it should be more visible as Map, Finance etc.
Right: it seems the administration done its best to hide the forum existence... but we're having a top-utility menu 1st level item as the Map, what can you ask more?
6) People register than forgot even the existence of Asgardia. (worst case)
That should have been prevented by L2 registration level... or you mean that even who confirmed his/her data ran away (maybe 'cause they saw what happened about the "Constitutional draft and voting affair")?
P.S: sorry for any grammatical or syntactic errors
Don't be sorry: we're not all anglophones here: at least, 70%(*) is not. ;-)))
"I wonder how Rebekah (or any other) can be sure that a picture in a profile is the "real" one of anyone, into Asgardia, having no official documents at all."
Moreover in this moment is impossibile to upload the picture so I must use default one
Try telling them into Bug Reports - Website and Forum. I did it recently (using Firefox browser).
(*)calculated using the first 13 countries' official languages in the list (total 173.132, anglophones 54.320 31,37%), being them 69,49% of the total asgardians number (249.153)