If there is an error in changing the PostgreSQL superuser password,
the following issues occurred:
* The error wasn't shown correctly, since the validation code used the
"original_password" field name instead of "password"
* Fixing the above caused the error to be shown both for the metric
destination password and the superuser password (changed input name
of metric destination password to "metric-destination-password" to
fix this).
* Errors with the password not matching are shown for the "password"
input, instead of the "repeat_password" input.
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