diff --git a/packages/client/src/i18n.ts b/packages/client/src/i18n.ts
index 31e066960..b50cd7290 100644
--- a/packages/client/src/i18n.ts
+++ b/packages/client/src/i18n.ts
@@ -1,5 +1,43 @@
 import { markRaw } from 'vue';
 import { locale } from '@/config';
-import { I18n } from '@/scripts/i18n';
+
+class I18n<T extends Record<string, any>> {
+	// This contains all defined keys, even if a string is missing in a particular language.
+	// This is achieved by setting English strings as a fallback during locale generation in /locales/index.js
+	public ts: T;
+
+	constructor(locale: T) {
+		this.ts = locale;
+		this.t = this.t.bind(this);
+	}
+
+	// The key is a string (rather than a Symbol) to allow for the dot-delimited names.
+	//
+	// If possible it should probably be preferred to use the locale directly (i.e. the ts member),
+	// because it may allow for vue to cache information.
+	//
+	// Performs string interpolation for patters like `{foo}` and replaces it with the respective value from `args` (using its `toString()` method).
+	// If a pattern is present in the string but not provided in args, it will not be replaced.
+	// If `args` is not provided, no interpolation is performed.
+	public t(key: string, args?: Record<string, string | number>): string {
+		try {
+			// Resolve dot-delimited names as properties of objects.
+			let str = key.split('.').reduce((o, i) => o[i], this.ts) as unknown as string;
+
+			// Perform string interpolation.
+			if (args) {
+				for (const [k, v] of Object.entries(args)) {
+					str = str.replace(`{${k}}`, v.toString());
+				}
+			}
+
+			return str;
+		} catch (err) {
+			// This should normally not happen because of the English language fallback strings, see comment for ts member.
+			console.warn(`missing localization '${key}'`);
+			return key;
+		}
+	}
+}
 
 export const i18n = markRaw(new I18n(locale));
diff --git a/packages/client/src/scripts/i18n.ts b/packages/client/src/scripts/i18n.ts
deleted file mode 100644
index 54184386d..000000000
--- a/packages/client/src/scripts/i18n.ts
+++ /dev/null
@@ -1,29 +0,0 @@
-export class I18n<T extends Record<string, any>> {
-	public ts: T;
-
-	constructor(locale: T) {
-		this.ts = locale;
-
-		//#region BIND
-		this.t = this.t.bind(this);
-		//#endregion
-	}
-
-	// string にしているのは、ドット区切りでのパス指定を許可するため
-	// なるべくこのメソッド使うよりもlocale直接参照の方がvueのキャッシュ効いてパフォーマンスが良いかも
-	public t(key: string, args?: Record<string, string | number>): string {
-		try {
-			let str = key.split('.').reduce((o, i) => o[i], this.ts) as unknown as string;
-
-			if (args) {
-				for (const [k, v] of Object.entries(args)) {
-					str = str.replace(`{${k}}`, v.toString());
-				}
-			}
-			return str;
-		} catch (err) {
-			console.warn(`missing localization '${key}'`);
-			return key;
-		}
-	}
-}