We can find a sorting order with the minimal total distance between where we place a language entry and where this entry would be in that language. If there’s no pair of languages A and Ä such that A > Ä in one and Ä > A in the other, then (I guess???) this total distance will be zero.
That’s also part of the reason I’ve chosen it for a placeholder / variable name! The actual placing is not important as long as it’s where speakers of the Ä language expect to find it.
Or suppose there’s languages Ä₁ and Ä₂, where in Ä₁ the ‘ä’ is the umlauted ‘a’ and in Ä₂ it’s a distinct letter. The language list would be displayed as:
A Ä₁ B C Z Ä₂
The only problem / corner case would be such a language Ä₀ that would e.g. sort ‘ä’ before ‘a’. I would still put it after, since it’s where most other readers would expect to find it.
