Update 03/07/2012

For easy language plugin to work you must ensure proper Joomla configuration.

Step by step Joomla configuration for Easy Language plugin :

1. Install language packs for your site front end.
(Extensions -> Extension Manager)
( You can download language packs HERE )

2. Install easy language plugin.
(Extensions -> Extension Manager)

3. Enable required plugins and modules.
(Extensions -> Plugin Manager)
enable : System - Easy Language
enable : System - Language Filter
(Extensions -> Module manager)
enable : Language Switcher (and publish it to become visible in front page)

4. For languages to appear in Language Switcher on front page,
you must create dummy menu for EVERY language you want to use.

This is example how to add dummy menu item for English language,
so english language will be available as choice in Language Switcher.
(You should repeat it for every other language you want to add)

We must replicate the real main menu item (Default Page) on each menu item of languages​​.

(Menus -> Menu manager -> add new menu)
Title : englishmenu (give a name which tell its your languagemenu)
Menu type : englishmenu (give a name which tell its your languagemenu)
- Press Save & Close
- Find your languagemenu in below table and click its name in "title" column.
- Click "New"
Menu Item Type : Articles » Category Blog (like the real menu item)
Menu Title : Home (give a name like the real main menu item)
Status : Unpublished Published
Default Page : Yes
Language : English (select language you want to appear in Language Switcher)
Change any other display options or metadata
- Press Save & Close
You will See Flag Appear near menu which meant this language will appear
now as a choice in Language Switcher.

The module Language Switcher must also be assigned to these menus.

Remember that this menu is invisible and dont need to have any articles
or content in it, Its dummy menu and its only purpose is to make
related language available as a choice in Language Switcher.