Adding time of schedule scan to Status field.

[sebastiancepeda]

Closes #140

[Neustradamus]

@dave-theunsub: What do you think about this PR?

[dave-theunsub]

That looks nice. I recommend changing the "at" - either leaving it out or using "@" or maybe you can think of something else. This way we don't need everyone to update the language files for the change of this one sentence as the change is minor.

[dave-theunsub]

If it's done like this, we won't need new translations:

    if ($scan) {
        $hour_spin_scan->set_value($scan_hour);
        $min_spin_scan->set_value($scan_minute);
        $scan_apply_btn->set_sensitive(FALSE);
        $scan_remove_btn->set_sensitive(TRUE);

        my $statement = _('A daily scan is scheduled');
        my ($status_line_text) =
          sprintf( "%s (%02d:%02d)", $statement, $scan_hour, $scan_minute );
        $scan_status_label->set_text($status_line_text);
    }

Anything between the _( ) portion ends up needing translation. This way we just work around it.