Distinguish singular and plural in error message

Singular ("index") should be used in this error message if only one non-existing colum is referenced.

a <- tibble(x=1:3, y=4:6)
a[3]
Error: Invalid column indexes: 3
Called from: stopc("Invalid column indexes: ", format_n(j[pos_too_large]))

[krlmlr]

I'm counting 6 occurrences of stopc(..., format_n()), which corresponds to error messages that would have to be adapted. We could probably enhance format_n() to support something like

format_n("Invalid column index(es): ", j[pos_too_large])

Would you like to contribute a PR?

[github-actions]

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