Custom field name translation in search query

Hello! Please, help me! How to translate custom field name in table view after search query?

Look at rt/share/html/Elements/ColumnMap:

[...]
CustomField => {
    attribute => sub { return shift @_ },
    title     => sub { return pop @_ },
    value     => sub {
        my $self = $WCOLUMN_MAP->{CustomField};
        my $cf   = $self->{load}->(@_);
[...]

you should be able to override this using the callback named Once in this file.