BuddyPress.org

Sounds to me like most of your requirements could be met with WP Multisite plus a few selected plugins and themes.
– P2 allows for front-end posting
– https://wordpress.org/extend/plugins/more-privacy-options/ expands WP’s default privacy options to allow blog admins to hide their blogs from everyone but themselves
– Forums could be accomplished with bbPress or a forum-specific WP plugin

Depending on what you need out of “blogs”, you might also be able to repurpose BuddyPress groups to do something similar. For instance:
– Each member is the sole member of a private/hidden group, and uses BP activity to “blog”. Since this happens through BP, there is no WP Dashboard involved.
– Likewise with Notes
– Depending on what you want with “Link List”, that can be pretty easily done with an additional profile field.
– Forums would of course be built in, in the form of non-private groups that the user could join.

How to decide? If you don’t need the rich functionality of blogs (post revision history, out of the box multimedia support, etc), then actually giving each user two WP blogs might be too much overhead. In that case, BP would be a good choice. The functionality that you’d need is all already there; your work would be limited to customizing and configuring the interface.

https://codex.buddypress.org/translations/

Have a look in the WordPress plugin repository for plugins that let your users switch language. You’ll also find plugins that support translation of page content (as opposed to the standard BP menus / text)

It is a WordPress setting, under the “Settings > General” pages.

You need to use a wordpress 3.0 compatible theme or create a child theme based on twentyten or buddypress and use that.

I read somewhere that buddypress can only work if you have network enabled on your wordpress as buddypress plugins activates as network try that see if it solves your problem.

You can create your own WordPress page template or widget and create a loop that calls the group avatars. The current groups widget is a good start to see how it works. Also check the theme files group loop.

Also https://wordpress.org/extend/plugins/wp-activate-users/

This is more of a WordPress thing, but yes, it’s possible.

Though, I would do it with only one page.
eg. example.com/dashboard

No need to create pages for every single user in your userbase!

I would create a custom page template wrapped around an “is_user_logged_in()” conditional so only logged in users can view it.

Then the admin can add whatever content s/he chooses for the “dashboard” page in the WP Page Admin area.

Might want to try Cubepoints BuddyPress integration… will probably need to be modified to do what you want.

You can definitely enable it after the fact. Here’s a tutorial: http://www.wpbeginner.com/wp-tutorials/how-to-enable-multi-site-option-in-wordpress-3-0/ I’d just test it before you do it since the change might affect some of the plugins you are using or other features of the site.