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Po francusku, ale obsługa prosta jak drut.

The language file is not loaded.
After review your code, I found that you place the load_plugin_textdomain in the constructor, see the follow:

/**
* Constructor
*/
function ReOrderPostWithinCategory() {
   load_plugin_textdomain('deefusereorder', false, basename(dirname(__FILE__)) . '/languages');

The load_plugin_textdomain function should be called only in the WordPress init hook.

Quick resovle:

I place the load_plugin_textdomain in the saveOptionPlugin function.

//Action qui sauvegardera le paamétrage du plugin
add_action('init', array(&$this, 'saveOptionPlugin'));

It Works.

Just what I was looking for!

I was so amazed how this plugin so fit to my need !
more is very easy,fast,light(have nothing to prove, but felt)...
what else ? it makes my day yey ;-)
i truly would like to recommend this one for those who looking forward re-ordering thing.

Merci beaucoup Aurélien, C vraiment Géniale.

What else can I say?!

It does one thing, but it does it perfectly.
Ajax interface is just the icing on the cake!

PS: this is the only way I found to effectively order custom content in custom taxonomies so easily... except studying and writing the needed code, which would have been painfully harder and slower.

(chances are that other plugins exist that do the same thing with the same results, but my search has stopped before discovering them)

Une interface intuitive pour gérer l'ordre de ses posts. Le tout en Ajax !