Command: /scoreboard teams option <team> nametagVisibility
Error: [Valid values for option nametagvisibility are: true and false]
Probably just a language problem, just like MC-48419 (AKA tile.ironTrapdoor.name, btw, there are about 8 bugs posted about this one.)
(don't care about the [] brackets, it just looks a little better this way)
Comments 2
This ticket is incomplete without the requested information, as no response has been received within a reasonable time, and they are assuming the issue has been resolved. If you are still experiencing this issue, they can reopen it at your request.
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Is this still a concern in the current Minecraft version 1.7.9 / Launcher version 1.3.11 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.