ManyToManyField + CheckboxSelectMultiple widget = wrong help message

[Sergiy Kuzmenko]

In forms:

class MyModelForm(ModelForm):
    class Meta:
        model = MyModel
        widgets = {
            'my_m2m_field': CheckboxSelectMultiple(),
        }

When rendering it to template help_text for my_m2m_field outputs Hold down "Control", or "Command" on a Mac, to select more than one. which is not applicable when using CheckboxSelectMultiple widget.

There is a bit of conceptual gap here. This message is widget specific, but it's defined in the model field (in django/db/models/fields/related.py line 1023 for Django 1.3)

[Karen Tracey]

Already reported multiple times: #16522, #16370, #9321

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