When last_modified is not in valid format the date will be set to null
Fixed look 'n feel to be like okeanos (except menus)
Added menu items for invitations and feedback in the user menu
CSS and aesthetic changes
Added a down arrow in the user menu
Added an option for user credentials on user menu
Added log out option in user menu
Added logoff option to username menu
Fixed date parsing in versions
When multiple files are selected the download option downloads all of them in multiple tabs
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