Django filter form not rendering - django

Question

I'm using a FilterSet to perform a filtering over a set of product. First of all, here is my code :
models.py
class Plat(models.Model):
titre = models.CharField(max_length = 100)
description = models.TextField(null = True)
allergenes = models.TextField(null = True)
prix = models.IntegerField(verbose_name = "Prix par portion")
chef = models.ForeignKey('inscription.Chef', on_delete = models.CASCADE)
date_prep = models.DateField(default=timezone.now, verbose_name="Date de préparation")
nb_portions = models.IntegerField(verbose_name = "Nombre de portions disponibles")
photo = models.ImageField(upload_to = "photos_plat/")
filters.py
class PlatFilter(django_filters.FilterSet):
class Meta:
model = Plat
fields = {
'titre': ['icontains'],
'prix': ['lte', 'gte'],
'nb_portions': ['gte'],
'date_prep': ['exact'],
}
views.py
def home(request):
plats = Plat.objects.all()
filter = PlatFilter(request.GET, queryset=plats)
return render(request, 'actualites/home.html', locals())
home.html
<form method="get">
{{ filter.form.as_p }}
<button type="submit">Search</button>
</form>
Everything is working perfectly but I want to make the form prettier and being able to customize the label names and so on so I use this code :
{% load widget_tweaks %}
<form method="get">
<div class="well">
<h4 style="margin-top: 0">Filtrer par</h4>
<div class="row">
<div class="form-group col-sm-4 col-md-3">
{{ filter.form.titre.label_tag }}
{% render_field filter.form.titre class="form-control" %}
</div>
</div>
<button type="submit" class="btn btn-primary">
<span class="glyphicon glyphicon-search"></span> Search
</button>
</div>
</form>
And here nothing is displayed except the "Filtrer par" and the submit button. I've correctly installed widget_tweaks. Why isn't it working ? I've made a few researchs and I was not able to find an answer.
Thanks in advance !