diff --git a/kanken_online/__init__.py b/kanken_online/__init__.py
index 5c3c160..b95881e 100644
--- a/kanken_online/__init__.py
+++ b/kanken_online/__init__.py
@@ -105,6 +105,8 @@ def create_app(test_config=None):
                 }
                 with open(Path(app.root_path, "static", "lang", f"{language}.json"), mode="w") as f:
                     json.dump(strings[language], f, ensure_ascii=False, indent=0)
+            
+            lang.update_languages()
             return redirect("/translations")
 
     # def use_english(text_id: str):
diff --git a/kanken_online/lang.py b/kanken_online/lang.py
index a9a6e9a..370b05f 100644
--- a/kanken_online/lang.py
+++ b/kanken_online/lang.py
@@ -1,98 +1,26 @@
+import json
+from pathlib import Path
 from flask import session
 
-EXISTING_STRINGS = {
-    "kanken_online",
-    "options",
-    "log_in",
-    "register",
-    "log_out",
-    "kanji",
-    "forum",
-    "main_page",
-    "username",
-    "password",
-    "search",
-    "search_placeholder",
-    "include_kanji",
-    "include_kotoba",
-    "username_required",
-    "password_required",
-    "incorrect_username",
-    "incorrect_password"
-    "about",
-    "about-para",
-    "indices",
-    "translations"
-}
+LanguageMapping = dict[str, str]
 
-ENGLISH = {
-    "kanken_online": "KankenOnline",
-    "options": "Options",
-    "log_in": "Log in",
-    "register": "Register",
-    "log_out": "Log out",
-    "kanji": "Kanji",
-    "forum": "Forum",
-    "main_page": "Main Page",
-    "username": "Username",
-    "password": "Password",
-    "search": "Search",
-    "search_placeholder": "Enter kanji or word",
-    "include_kanji": "Include kanji",
-    "include_kotoba": "Include kotoba",
-    "username_required": "Username required.",
-    "password_required": "Password required.",
-    "incorrect_username": "Incorrect username.",
-    "incorrect_password": "Incorrect password.",
-    "about": "About KankenOnline",
-    "about-para": "KankenOnline is a website seeking to provide resources to pass the Kanji Kentei level 1 exam. You can search through the approximately 6,300 characters included in Kanken, as well as generate a number of study materials automatically. For example, you can generate a PDF-format exam resembling the Kanken level 1 exam, which has the goal of mirroring the real thing as closely as possible for your preparation. Additionally, a variety of information about kanji is provided, among which phonetic series, rimes/kanji phonology, radicals, inseparable kanji, character origins and etymologies.",
-    "indices": "Indices",
-    "radical_index": "Radical index",
-    "indivisible_index": "Indivisible kanji index",
-    "phonetic_series": "Phonetic series",
-    "dark_theme": "Dark theme",
-    "light_theme": "Light theme",
-    "language": "Language",
-    "theme": "Color settings",
-    "translations": "Translations",
-}
+def load_language(lang_code: str) -> LanguageMapping:
+    with open(Path("kanken_online/static/lang", f"{lang_code}.json")) as f:
+        return json.load(f)
 
-JAPANESE = {
-    "kanken_online": "漢検オンライン",
-    "options": "設定",
-    "log_in": "ログイン",
-    "register": "登録",
-    "log_out": "ログアウト",
-    "kanji": "漢字",
-    "forum": "掲示板",
-    "main_page": "ホームページ",
-    "username": "ユーザー名",
-    "password": "パスワード",
-    "search": "検索",
-    "search_placeholder": "漢字・言葉を入力",
-    "include_kanji": "漢字を含む",
-    "include_kotoba": "言葉を含む",
-    "username_required": "ユーザー名が必要です",
-    "password_required": "パスワードが必要です",
-    "incorrect_username": "ユーザー名が違います",
-    "incorrect_password": "パスワードが違います",
-    "about": "漢検オンラインとは",
-    "about-para": "漢検オンラインとは、漢検一級合格を目当てにした資料を供用しているサイトです。ここで漢検のやく６３００字を検索でき、いろんな勉強材を自動的に作ることができます。たとえば、漢検一級模様の試験PDFを作ることができて、本物の漢検試験に大抵該当することが目的です。さらに、色々漢字についての情報を取り集めております。諧声域（かいせいいき）・音韻学・部首・不可分漢字・字源・語源などがその内です。",
-    "indices": "索引",
-    "radical_index": "部首索引",
-    "indivisible_index": "不可分漢字索引",
-    "phonetic_series": "諧声域索引",
-    "dark_theme": "ダークモード",
-    "light_theme": "ライトモード",
-    "language": "言語",
-    "theme": "色設定",
-    "translations": "翻訳",
-}
+LANGUAGES = {}
 
-LANGUAGES = {
-    "en": ENGLISH,
-    "ja": JAPANESE
-}
+def update_languages():
+    ENGLISH = load_language("en")
+    JAPANESE = load_language("ja")
+
+    global LANGUAGES
+    LANGUAGES = {
+        "en": ENGLISH,
+        "ja": JAPANESE
+    }
+
+update_languages()
 
 # assert all(all(key in lang for key in EXISTING_STRINGS) for lang in LANGUAGES)  # Ensure all strings are mapped for all existing languages
 # assert not [key for lang in LANGUAGES for key in lang if ((key in lang) and (key not in EXISTING_STRINGS))]