Rename pages in left menu and titles
In left menu:
- "User" to "Users"
- "Roles" to "Users roles"
In page titles:
- "User" to "Users managment"
- "Roles" to "Users roles managment"
- "Groups" to "Groups managment"
- "Users" to "Requests managment" (Requests page)
- "Policies" to "Policies managment"
In page tabs:
- "User list" to "Users list" (Users page)