added nh_safe filter in envipytags.py and updated some of the existing 'safe' to 'nh_safe'

epdb/templatetags/envipytags.py

@@ -1,4 +1,7 @@
 from django import template
+from django.conf import settings as s
+from django.utils.safestring import mark_safe
+import nh3
 
 register = template.Library()
 
@@ -6,3 +9,9 @@ register = template.Library()
 @register.filter
 def classname(obj):
     return obj.__class__.__name__
+
+
+@register.filter(name="nh_safe")
+def nh_safe(txt: str):
+    clean_html = nh3.clean(txt, tags=s.ALLOWED_HTML_TAGS)
+    return mark_safe(clean_html)