If 2 works both have an alias with the same locale (say, English) then the merge will fail as the target work would now have 2 aliases with the same locale. This violates the current invariant that there can only be 1 work per locale. I don't know how to best solve this.

Possibly options are:

• Fail the merge
• Remove the locale from offending aliases, leaving only one alias with that locale (preferring the merge target)
• Remove the offending aliases entirely, leaving only one alias with that locale (preferring the merge target)