[otrs] Migrating Free Fields from OTRS2 to OTRS3

I defined some free fields in my OTRS Helpdesk 2.4. After I upgrading to 3.1, only fields like 'Due Date' are properly translated. Everything else are in Z_Deprecated, how do I use them as before? And any way to translated them? Do I need to manual add them to dynamic fields one by one?