how to do Localization in jquerry or javascript using i18n?

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Javascript

jQuery

I18N

I am simple example on fiddle of localization using i18n.js file.Actually when user select English it show name and Roll No .But it change the language it display french text (different from english text ). How to do this task.? Here is my fiddle
http://jsfiddle.net/rGpCE/32/

<select id="mydropdownid">
  <option value="en">English</option>
  <option value="fr">French</option>

</select>

<label style="display:block">name </label>
<label style="display:block">Roll no </label>