Change log message and level
Change log message and level

When the validation that checks that an entry is not already deleted
fails, the right thing to do is to add the error to the entry.errors
list and write a log message with low priority. The class that triggers
the validation has the responsability of handling the validation failure
and logging with a higher priority if necessary.

For example this validation may be triggered because some other class
invokes entry.valid?. In this case the entry is not actually being
saved, so the old log message was incorrect. Also this is not an error
by itself, the class invoking entry.valid? will receive a false response
and do whatever is necessary, without it necessarily being an error.

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