title: Wagtail Page title overwriting
body: <p><a href="https://i.stack.imgur.com/B20Jr.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/B20Jr.png" alt="enter image description here"></a></p>
  
  <p>I have this model above, and I would like to remove the title. Or rename it. Actually the match number itself is a title of this model. So I need one of the following options:</p>
  
  <ul>
  <li>Rename Title to "Match Number"</li>
  <li>Add custom help text to Title "Add a Number of Match"</li>
  <li>Remove Title</li>
  </ul>
  
  <p>My model:</p>
  
  <pre><code>class Match(Page):
      match_number = models.PositiveSmallIntegerField(blank=True)
      team_1 = models.ForeignKey(
          TeamRooster,
          null=True, blank=True,
          on_delete=models.SET_NULL,
          related_name="+",
      )
      team_1_color = ColorField(default='#ff0000', blank=True)
      team_1_score = models.PositiveSmallIntegerField(blank=True)
      team_2 = models.ForeignKey(
          TeamRooster,
          null=True, blank=True,
          on_delete=models.SET_NULL,
          related_name="+",
      )
      team_2_color = ColorField(default='#0066ff', blank=True)
      team_2_score = models.PositiveSmallIntegerField(blank=True)
      match_starts_at = models.DateTimeField()
  
  
      parent_page_types = ['Matches']
  
      content_panels = [
          FieldPanel('title'),
          FieldPanel('match_number', classname="6"),
          FieldPanel('match_starts_at', classname="6"),
          MultiFieldPanel([
              FieldPanel('team_1', classname="12"),
              FieldPanel('team_1_color', classname="6"),
              FieldPanel('team_2_score', classname="6"),
          ], heading="Team 1"),
          MultiFieldPanel([
              FieldPanel('team_2', classname="12"),
              FieldPanel('team_2_color', classname="6"),
              FieldPanel('team_2_score', classname="6"),
          ], heading="Team 2"),
      ]
  </code></pre>