Language Switcher

Switch application interface language between English and Japanese.

Switch application interface language between English and Japanese. Language Switcher allows users to change all UI text, labels, and messages to their preferred language with instant application across the entire interface.

Capabilities

• Switch between two language options (English, Japanese)
• Access language controls from user profile menu
• Apply language changes instantly without page reload
• Persist language preference across sessions and devices
• Translate all interface elements (navigation, buttons, labels, messages)
• Preview language changes immediately upon selection
• Maintain language consistency across all application pages

How to Use

1. Open user profile menu:

   • Click user profile button at bottom of sidebar (shows avatar and name)
   • Profile menu opens displaying user information and settings
   • Language switcher appears below theme switcher in menu

2. View current language:

   • Language switcher displays as two tabs (EN and JA) in horizontal row
   • Current language shows with highlighted/selected state
   • EN tab represents English, JA tab represents Japanese (日本語)
   

3. Switch to Japanese:

   • Click JA tab to activate Japanese language
   • Interface immediately translates all text to Japanese
   • Navigation items update: “Home” → “ホーム”, “Teams” → “チーム”
   • Menu items translate: “Account settings” → “アカウント設定”, “Help” → “ヘルプ”, “Log out” → “ログアウト”
   • Selection persists automatically for future sessions
   

4. Switch to English:

   • Click EN tab to activate English language
   • Interface reverts all text to English
   • All navigation and UI elements display in English
   • Language selection saves automatically

5. Verify language application:

   • Close profile menu by clicking outside or pressing Escape
   • Navigate through application pages to confirm language consistency
   • Language applies to all UI elements (sidebar, content, dialogs, buttons, forms)

Requirements

Requirement	Details
Permission	Any authenticated user
Browser	Chrome, Firefox, Safari (latest 2 versions)
Storage	Browser localStorage enabled for preference persistence

Limitations

Limitation	Value
Language options	2 languages (English, Japanese)
Custom languages	No additional language support or user-defined translations
Persistence	Per-device storage (does not sync across multiple devices)
Transition	Instant switch (no animation or fade effect)
Partial translation	All UI elements translate (no mixed-language mode)

Not Supported:

• Adding custom languages or translations
• Creating regional language variants (en-US, en-GB, ja-JP)
• Automatic language detection from browser preferences
• Translating user-generated content (project names, document text)
• Scheduling automatic language changes by time or location
• Importing or exporting custom translation files
• Per-project language preferences (language applies globally)
• Right-to-left (RTL) language support (Arabic, Hebrew)
• Sharing language preferences across multiple devices
• Language preview before applying selection
• Reverting to previous language with undo button

Configuration

Setting	Default	Description
Default language	English	New users start with English interface
Storage method	localStorage	Language preference stored in browser localStorage
Storage key	language	Key name for localStorage language value
Application scope	Global	Language applies to entire application uniformly
Fallback	English	Untranslated strings default to English

Related

• User Profile Menu - Accessing account settings and preferences
• Theme Switcher - Changing application appearance
• Sidebar Navigation - Navigating between sections