fix: resolve CI/CD issues and linting errors

regex_humanizer/translator.py

@@ -1,6 +1,3 @@
-"""Translator for converting regex AST to human-readable English."""
-
-from typing import Optional
 from .parser import (
     RegexNode, NodeType, LiteralNode, CharacterClassNode,
     QuantifierNode, GroupNode, RegexParser
@@ -282,7 +279,7 @@ class RegexTranslator:
 
     def _translate_backreference(self, node: RegexNode) -> str:
         """Translate a backreference."""
-        return f"same as capture group \\\{node.raw}"
+        return f"same as capture group \\{node.raw}"
 
 
 def translate_regex(pattern: str, flavor: str = "pcre") -> str: