Some labels displaying wrong

On a CB2.0 upgrade, I have some labels showing their db name, not label, e.g.

User edit/profile book:
Enable Profile Entries _UE_YES _UE_NO
Auto Publish _UE_YES _UE_NO
Notify Me _UE_YES _UE_NO

Or in admin, on a tab:
_UE_PROFILE_GALLERY

How do I correct this?

CB ProfileBook and CB ProfileGallery language strings are not included with CB core anymore (those plugins are no a part of the core). When we've bug fix releases available for those plugins (they're not CB 2.0 compatible yet) we'll generate language files for them. For now you'd have to manually add those strings for translation to your CB language files. Example as follows.

'_UE_YES' => 'Yes'

Thanks.

Does this mean they are not really needed or 'old hat'?

If the field lets you then you can edit it within CB > Field Management and just change _UE_YES to "Yes" if you like. You can then translate "Yes" (I think it already is) if you wanted. It's up to you how you want to approach it. We'll have language files for those plugins when we release their upgraded versions.