Turn xmlui/jspui.user.assumelogin property to the new webui.user.assumelogin, add custom jsp error to show no loginas action reason
Add link to return at epeople admin page, Add throw only authorizeexception, Show custom errorpage in the case of superadmin loginas superadmin
Add one error jsp with only a message, remove i18n for authorize exception message
Merge pull request #1 from lap82/DS-1622

[DS-1622] Uniform property xmlui/jspui in webui.user.assumelogin