AFKLM Force Language

A Tampermonkey userscript to force any language on all AFKLM group websites (Air France, KLM, Transavia, Flying Blue, etc.). The user can input any language code (e.g., en-US, fr-FR, de-DE, ja-JP, zh-CN, etc.) to override the default language.

Features

• Forces the Accept-Language header to the user's chosen language for all requests to AFKLM domains.
• Redirects any language path (e.g., /fr/, /de/, /es/) to the chosen language path (e.g., /en/).
• Removes all language-related cookies (e.g., lang, language, locale, country).
• Allows the user to input any language code via a prompt.
• Works on all AFKLM domains:
  • Air France (airfrance.fr, airfrance.com, etc.)
  • KLM (klm.com, klm.nl, etc.)
  • Transavia (transavia.com, transavia.fr, etc.)
  • Flying Blue (flyingblue.com, etc.)
  • Other AFKLM domains (afklm.com, hop.fr, joon.com, servair.com, etc.)

Installation

1. Install Tampermonkey:

   • Firefox
   • Chrome

2. Add the Script:

   • Click the Tampermonkey icon in your browser.
   • Select "Create a new script".
   • Delete the default content and paste the content of afklm-force-language.user.js.
   • Save the script (Ctrl+S or Cmd+S).

3. Set Your Language:

   • Click the Tampermonkey icon in your browser.
   • Select the script "AFKLM Force Language".
   • Choose "Set Custom Language".
   • Enter your desired language code (e.g., en-US, fr-FR, de-DE, ja-JP, zh-CN).
   • The script will automatically apply the new language.

How It Works

1. HTTP Headers: The script overrides the fetch and XMLHttpRequest functions to force the Accept-Language header to the user's chosen language for all requests to AFKLM domains.

2. URL Redirection: If the URL path contains a 2-letter language code (e.g., /fr/, /de/), it redirects to the equivalent path in the chosen language (e.g., /en/).

3. Cookie Cleanup: The script removes all cookies related to language preferences (e.g., lang, language, locale, country).

4. User Input: The script uses Tampermonkey's GM_prompt to let the user input any language code. The code is then formatted for the Accept-Language header (e.g., en-US becomes en-US,en;q=0.9).

Examples of Language Codes

Here are some common language codes you can use:

Language	Code
English	en-US
French	fr-FR
German	de-DE
Spanish	es-ES
Dutch	nl-NL
Italian	it-IT
Japanese	ja-JP
Chinese	zh-CN
Korean	ko-KR
Portuguese	pt-PT
Russian	ru-RU
Arabic	ar-SA

Testing

Input URL	Forced Language	Expected Result
airfrance.fr/fr/accueil	en-US	Redirects to airfrance.fr/en/accueil
klm.com/de/angebote	fr-FR	Redirects to klm.com/fr/angebote
transavia.nl/nl/vluchten	ja-JP	Redirects to transavia.nl/ja/vluchten
flyingblue.com/it/offerte	zh-CN	Redirects to flyingblue.com/zh/offerte

Default Language

The default language is set to English (en-US,en;q=0.9). You can change it at any time using the Tampermonkey menu.

License

This project is licensed under the MIT License - see the LICENSE file for details.