Fix issue zostera#153/zostera#223

Author: isolationism

Diff for: src/django_bootstrap5/renderers.py

@@ -488,12 +488,17 @@ def render(self):
         errors = self.get_errors_html()
 
         if self.is_form_control_widget():
-            addon_before = (
-                format_html('<span class="input-group-text">{}</span>', self.addon_before) if self.addon_before else ""
-            )
-            addon_after = (
-                format_html('<span class="input-group-text">{}</span>', self.addon_after) if self.addon_after else ""
-            )
+            addon_before_wrapper = self.addon_before or ""
+            addon_after_wrapper = self.addon_after or ""
+            if self.addon_before and self.addon_before_class is not None:
+                addon_before_wrapper = format_html(
+			f'<span class="{self.addon_before_class}">{self.addon_before}</span>'
+		)
+	    if self.addon_after and self.addon_after_class is not None:
+	                addon_before_wrapper = format_html(
+			f'<span class="{self.addon_after_class}">{self.addon_after}</span>'
+		)
+
             if addon_before or addon_after:
                 classes = "input-group"
                 if self.server_side_validation and self.get_server_side_validation_classes():