Frederick I Barbarossa used as hero unit and Great Person

[damerell]

Discussion on Discord:

[15:12]Murdermesa: why would that be a bug  [15:13]damerell: Because there was only one of him [15:13]Murdermesa: the great person thing is just flavour [15:14]damerell: So is the flavour on a hero unit. It seemed at least plausible that you might not want to use the same flavour twice. [15:15]Murdermesa: true could be fixed

Hence I'm opening this issue to suggest one of them (probably the GP, which is just one of a list of names) be removed.