アイヌ語追加 (#428) (#433)

Reviewed-on: #433
Co-authored-by: miteruzo <miteruzo@naver.com>

frontend/src/lib/settings.ts

@@ -347,7 +347,8 @@ const safeParseClientSettings = (raw: string | null): ClientSettings => {
 
 
 export const loadClientSettings = (): ClientSettings =>
-    safeParseClientSettings (localStorage.getItem (CLIENT_SETTINGS_STORAGE_KEY))
+    safeParseClientSettings (typeof window === 'undefined'
+	? null : localStorage.getItem (CLIENT_SETTINGS_STORAGE_KEY))
 
 
 export const saveClientSettings = (settings: ClientSettings): void => {
@@ -790,7 +791,8 @@ export const seedClientThemeMode = (theme: UserSettings['theme']): void => {
 
 
 const prefersDarkTheme = (): boolean =>
-    window.matchMedia ('(prefers-color-scheme: dark)').matches
+    typeof window !== 'undefined'
+    && window.matchMedia ('(prefers-color-scheme: dark)').matches
 
 
 export const resolveThemeMode = (