diff --git a/src/plugins/i18n.ts b/src/plugins/i18n.ts
index 91006979b..2832359f6 100644
--- a/src/plugins/i18n.ts
+++ b/src/plugins/i18n.ts
@@ -1,110 +1,114 @@
-import i18next from 'i18next';
-import LanguageDetector from 'i18next-browser-languagedetector';
-
-import { deConfig } from '#app/locales/de/config.js';
-import { enConfig } from '#app/locales/en/config.js';
-import { esConfig } from '#app/locales/es/config.js';
-import { frConfig } from '#app/locales/fr/config.js';
-import { itConfig } from '#app/locales/it/config.js';
-import { zhCnConfig } from '#app/locales/zh_CN/config.js';
-
-export interface SimpleTranslationEntries {
-  [key: string]: string
-}
-
-export interface MoveTranslationEntry {
-  name: string,
-  effect: string
-}
-
-export interface MoveTranslationEntries {
-  [key: string]: MoveTranslationEntry
-}
-
-export interface AbilityTranslationEntry {
-  name: string,
-  description: string
-}
-
-export interface AbilityTranslationEntries {
-  [key: string]: AbilityTranslationEntry
-}
-
-export interface Localizable {
-  localize(): void;
-}
-
-export function initI18n(): void {
-  let lang = '';
-
-  if (localStorage.getItem('prLang'))
-    lang = localStorage.getItem('prLang');
-
-  /**
-   * i18next is a localization library for maintaining and using translation resources.
-   *
-   * Q: How do I add a new language?
-   * A: To add a new language, create a new folder in the locales directory with the language code.
-   *    Each language folder should contain a file for each namespace (ex. menu.ts) with the translations.
-   *    Don't forget to declare new language in `supportedLngs` i18next initializer
-   *
-   * Q: How do I add a new namespace?
-   * A: To add a new namespace, create a new file in each language folder with the translations.
-   *    Then update the `resources` field in the init() call and the CustomTypeOptions interface.
-   *
-   * Q: How do I make a language selectable in the settings?
-   * A: In src/system/settings.ts, add a new case to the Setting.Language switch statement.
-   */
-
-  i18next.use(LanguageDetector).init({
-    lng: lang,
-    fallbackLng: 'en',
-    supportedLngs: ['en', 'es', 'fr', 'it', 'de', 'zh_CN'],
-    debug: true,
-    interpolation: {
-      escapeValue: false,
-    },
-    resources: {
-      en: {
-        ...enConfig
-      },
-      es: {
-        ...esConfig
-      },
-      fr: {
-        ...frConfig
-      },
-      it: {
-        ...itConfig
-      },
-      de: {
-        ...deConfig
-      },
-      zh_CN: {
-        ...zhCnConfig
-      }
-    },
-  });
-}
-
-// Module declared to make referencing keys in the localization files type-safe.
-declare module 'i18next' {
-  interface CustomTypeOptions {
-    resources: {
-      menu: SimpleTranslationEntries;
-      menuUiHandler: SimpleTranslationEntries;
-      move: MoveTranslationEntries;
-      battle: SimpleTranslationEntries,
-      ability: AbilityTranslationEntries;
-      pokeball: SimpleTranslationEntries;
-      pokemon: SimpleTranslationEntries;
-      pokemonStat: SimpleTranslationEntries;
-      commandUiHandler: SimpleTranslationEntries;
-      fightUiHandler: SimpleTranslationEntries;
-      tutorial: SimpleTranslationEntries;
-      starterSelectUiHandler: SimpleTranslationEntries;
-    };
-  }
-}
-
-export default i18next;
+import i18next from 'i18next';
+import LanguageDetector from 'i18next-browser-languagedetector';
+
+import { deConfig } from '#app/locales/de/config.js';
+import { enConfig } from '#app/locales/en/config.js';
+import { esConfig } from '#app/locales/es/config.js';
+import { frConfig } from '#app/locales/fr/config.js';
+import { itConfig } from '#app/locales/it/config.js';
+import { zhCnConfig } from '#app/locales/zh_CN/config.js';
+import { jpConfig } from '#app/locales/jp/config.js';
+
+export interface SimpleTranslationEntries {
+  [key: string]: string
+}
+
+export interface MoveTranslationEntry {
+  name: string,
+  effect: string
+}
+
+export interface MoveTranslationEntries {
+  [key: string]: MoveTranslationEntry
+}
+
+export interface AbilityTranslationEntry {
+  name: string,
+  description: string
+}
+
+export interface AbilityTranslationEntries {
+  [key: string]: AbilityTranslationEntry
+}
+
+export interface Localizable {
+  localize(): void;
+}
+
+export function initI18n(): void {
+  let lang = '';
+
+  if (localStorage.getItem('prLang'))
+    lang = localStorage.getItem('prLang');
+
+  /**
+   * i18next is a localization library for maintaining and using translation resources.
+   *
+   * Q: How do I add a new language?
+   * A: To add a new language, create a new folder in the locales directory with the language code.
+   *    Each language folder should contain a file for each namespace (ex. menu.ts) with the translations.
+   *    Don't forget to declare new language in `supportedLngs` i18next initializer
+   *
+   * Q: How do I add a new namespace?
+   * A: To add a new namespace, create a new file in each language folder with the translations.
+   *    Then update the `resources` field in the init() call and the CustomTypeOptions interface.
+   *
+   * Q: How do I make a language selectable in the settings?
+   * A: In src/system/settings.ts, add a new case to the Setting.Language switch statement.
+   */
+
+  i18next.use(LanguageDetector).init({
+    lng: lang,
+    fallbackLng: 'en',
+    supportedLngs: ['en', 'es', 'fr', 'it', 'de', 'zh_CN', 'jp'],
+    debug: true,
+    interpolation: {
+      escapeValue: false,
+    },
+    resources: {
+      en: {
+        ...enConfig
+      },
+      es: {
+        ...esConfig
+      },
+      fr: {
+        ...frConfig
+      },
+      it: {
+        ...itConfig
+      },
+      de: {
+        ...deConfig
+      },
+      zh_CN: {
+        ...zhCnConfig
+      },
+      jp: {
+        ...jpConfig
+      }
+    },
+  });
+}
+
+// Module declared to make referencing keys in the localization files type-safe.
+declare module 'i18next' {
+  interface CustomTypeOptions {
+    resources: {
+      menu: SimpleTranslationEntries;
+      menuUiHandler: SimpleTranslationEntries;
+      move: MoveTranslationEntries;
+      battle: SimpleTranslationEntries,
+      ability: AbilityTranslationEntries;
+      pokeball: SimpleTranslationEntries;
+      pokemon: SimpleTranslationEntries;
+      pokemonStat: SimpleTranslationEntries;
+      commandUiHandler: SimpleTranslationEntries;
+      fightUiHandler: SimpleTranslationEntries;
+      tutorial: SimpleTranslationEntries;
+      starterSelectUiHandler: SimpleTranslationEntries;
+    };
+  }
+}
+
+export default i18next;
\ No newline at end of file