Hi Sumolari,
The WP Carousel plugin is messing with internationalization of javascript used by WordPress.
When the plugin is active, the localization of common javascript files (not used by WP Carousel) does not work.
The problem seems to be related by calling wp_enqueue_script() before init.
Please refer to this TRAC bug for more information:
http://core.trac.wordpress.org/ticket/10278#comment:8
http://core.trac.wordpress.org/ticket/10278#comment:9
Saludos!