Fixed #35172 -- Fixed intcomma for string floats.

Thanks Warwick Brown for the report.

Regression in 55519d6cf8.

django/contrib/humanize/templatetags/humanize.py

@@ -80,6 +80,8 @@ def intcomma(value, use_l10n=True):
     if match:
         prefix = match[0]
         prefix_with_commas = re.sub(r"\d{3}", r"\g<0>,", prefix[::-1])[::-1]
+        # Remove a leading comma, if needed.
+        prefix_with_commas = re.sub(r"^(-?),", r"\1", prefix_with_commas)
         result = prefix_with_commas + result[len(prefix) :]
     return result