Assumption number one: that the DW translation system is still broadly similar to the LJ translation system. Assumption number two: that I actually understand the LJ translation system well enough to be right about this.
With the above in mind, it seems to me that, on a technical level, it would be very straightforward for anyone with the appropriate site text translation privilege to edit the error message strings to something helpful. And edit the IdentityURL prompt string similarly. It wouldn't even need a code push. (viz LJ's recent genderfail, which appeared to be created via the same mechanism.)
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Assumption number two: that I actually understand the LJ translation system well enough to be right about this.
With the above in mind, it seems to me that, on a technical level, it would be very straightforward for anyone with the appropriate site text translation privilege to edit the error message strings to something helpful. And edit the IdentityURL prompt string similarly. It wouldn't even need a code push. (viz LJ's recent genderfail, which appeared to be created via the same mechanism.)