Remove special characters restriction in category names (#3370)

* [FR]Special characters restriction in category names
Fixes #3358

* remove old validation test

InvenTree/part/migrations/0081_alter_partcategory_name.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.14 on 2022-07-20 16:09
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0080_alter_part_image'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='partcategory',
+            name='name',
+            field=models.CharField(help_text='Name', max_length=100, verbose_name='Name'),
+        ),
+    ]

InvenTree/part/test_category.py

@@ -1,6 +1,5 @@
 """Unit tests for the PartCategory model"""
 
-from django.core.exceptions import ValidationError
 from django.test import TestCase
 
 from .models import Part, PartCategory, PartParameter, PartParameterTemplate
@@ -109,19 +108,6 @@ class CategoryTest(TestCase):
                     part_parameter.pop(item)
                 self.assertEqual(len(part_parameter), 1)
 
-    def test_invalid_name(self):
-        """Test that an illegal character is prohibited in a category name"""
-        cat = PartCategory(name='test/with/illegal/chars', description='Test category', parent=None)
-
-        with self.assertRaises(ValidationError) as err:
-            cat.full_clean()
-            cat.save()  # pragma: no cover
-
-        self.assertIn('Illegal character in name', str(err.exception.error_dict.get('name')))
-
-        cat.name = 'good name'
-        cat.save()
-
     def test_delete(self):
         """Test that category deletion moves the children properly."""
         # Delete the 'IC' category and 'Transceiver' should move to be under 'Electronics'