diff --git a/localization/preprocess.py b/localization/preprocess.py
index 06a2269..b0f8ffe 100644
--- a/localization/preprocess.py
+++ b/localization/preprocess.py
@@ -2,52 +2,52 @@ import os
 import re
 import glob
 import json
+from typing import Generator, List, Dict, Any
 
 from parse_rc_file import parse_rc_file
 
 
-base_lang = "en"
-available_langs = [dir for dir in os.listdir(os.path.dirname(__file__)) if re.match(r"^\w+(-\w+)?$", dir)]
-target_langs = [lang for lang in available_langs if lang != base_lang]
+base_lang: str = "en"
+available_langs: List[str] = [dir for dir in os.listdir(os.path.dirname(__file__)) if re.match(r"^\w+(-\w+)?$", dir)]
+target_langs: List[str] = [lang for lang in available_langs if lang != base_lang]
 
 print("Target languages:", target_langs)
 
 # & defines accelerators (hotkeys) in menus and buttons and things, which get underlined in the UI.
 # & can be escaped by doubling it, e.g. "&Taskbar && Start Menu"
-def index_of_hotkey(text):
-	# Returns the index of the ampersand that defines a hotkey, or -1 if not present.
-	# The space here handles beginning-of-string matching and counteracts the offset for the [^&] so it acts like a negative lookbehind
+def index_of_hotkey(text: str) -> int:
+    # Returns the index of the ampersand that defines a hotkey, or -1 if not present.
+    # The space here handles beginning-of-string matching and counteracts the offset for the [^&] so it acts like a negative lookbehind
     m = re.search(r"[^&]&[^&\s]", f" {text}")
     return m.start() if m else -1
 
-def has_hotkey(text):
+def has_hotkey(text: str) -> bool:
     return index_of_hotkey(text) != -1
 
-def remove_hotkey(text):
+def remove_hotkey(text: str) -> str:
     text = re.sub(r"\s?\(&.\)", "", text)
     text = re.sub(r"([^&]|^)&([^&\s])", r"\1\2", text)
     return text
 
-def remove_ellipsis(string):
+def remove_ellipsis(string: str) -> str:
     return string.replace("...", "")
 
-def get_strings(lang):
-    rc_files = glob.glob(f"{os.path.dirname(__file__)}/{lang}/**/*.rc", recursive=True)
+def get_strings(lang: str) -> Generator[str, None, None]:
+    rc_files: List[str] = glob.glob(f"{os.path.dirname(__file__)}/{lang}/**/*.rc", recursive=True)
     for rc_file in rc_files:
         with open(rc_file, "r", encoding="utf16") as f:
             yield from parse_rc_file(f.read().replace("\ufeff", ""))
 
-
-base_strings = list(get_strings(base_lang))
+base_strings: List[str] = list(get_strings(base_lang))
 for target_lang in target_langs:
-    target_strings = list(get_strings(target_lang))
-    localizations = {}
+    target_strings: List[str] = list(get_strings(target_lang))
+    localizations: Dict[str, Any] = {}
 
-    def add_localization(base_string, target_string, fudgedness):
+    def add_localization(base_string: str, target_string: str, fudgedness: int) -> None:
         localizations[base_string] = localizations.get(base_string, [])
         localizations[base_string].append({"target_string": target_string, "fudgedness": fudgedness})
 
-    def add_localizations(base_strings, target_strings):
+    def add_localizations(base_strings: List[str], target_strings: List[str]) -> None:
         for i, target_string in enumerate(target_strings):
             if len(base_strings) <= i:
                 break
@@ -66,7 +66,9 @@ for target_lang in target_langs:
     add_localizations(base_strings, target_strings)
 
     for base_string, options in localizations.items():
-        options.sort(key=lambda x: x["fudgedness"])
+        def get_fudgedness(translation_option: Dict[str, Any]) -> int:
+            return translation_option["fudgedness"]
+        # options.sort(key=lambda x: x["fudgedness"])
         unique_strings = list(set(option["target_string"] for option in options))
         if len(unique_strings) > 1:
             unique_strings_json = json.dumps(unique_strings, ensure_ascii=False, indent="\t")