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I think an easier way to do that is by adding the HTML class to the field properties. You can do this by.
field = forms.CharField(widget=forms.TextInput(attrs={'class': 'form-control'}))
In that whay, you would only need to do:
<label class="control-label" for="id_{{ field.name }}">{{ field.label }}</label>
{{ field }}
edit: models -> forms
Source:stackexchange.com