parameters were in the wrong order

shorter lines, and alignment in text messages. rewrite
fr/install.html.

 - mostly undo fde7e5a6 in inc/lang/fr/newpage.txt
 - restore formatting and author of d9de855c

 - mostly undo fde7e5a6
 - restore author and formatting of de78e4ef

 - mostly undo fde7e5a6 for inc/lang/fr/pwconfirm.txt
 - apply short line length to all lines

 - mostly undo fde7e5a6 for inc/lang/fr/revisions.txt
 - restore text and author of c1fe9e9f

 - mostly undo fde7e5a6 for inc/lang/fr/recent.txt
 - restore d288e197 text and author

instead the visibility is properly checked in the visibleInContext()
method.

Since we want to check the access to the Admin plugins on an individual
basis, we need to grant access to all logged in users at first. This
means a user could access the admin page, but would not see any plugins
available.

This adds a new method that capsulates the access check that has to be
done to decide if an admin plugin's page should be shown to the user.
The default implementation is the same as before, relying only on the
forAdminOnly() method and the users' isadmin or ismanager status.

Admin plugins themselves can override the method to do additional
checks. In this patch, I added that to the usermanager plugin which will
only return true if the current auth backend can list users.

However the real idea behind this change is that the new method emits a
new event called ADMINPLUGIN_ACCESS_CHECK which would allow plugins to
overwrite it. This way it could be possible to give certain user groups
access to certain admin plugins without giving them admin or manager
permissions.

Note: this does not change how the "Admin" link is shown, it still
depends on ismanager or isadmin. A plugin as mentioned above would need
to influence the display via the MENU_ITEMS_ASSEMBLY event.

Note: this only covers the basic access check. Admin plugins may need
further adjustments for access to other parts of the plugin (like AJAX
components). An additional commit will update this for the bundled
plugins.

This syntax can be used by IDEA and other IDEs to mark the constants as
deprecated in the editor.