The plugin you have installed hooks into the_content() function which is called within the post loop on your posts – this is why it works there and not the text only widgets. You may find a PHP widget will work OR you can use PHP to run your shortcode using the do_shortcode function.
PHP widget plugin: http://wordpress.org/plugins/php-code-widget/
Shortcode example:
<? echo do_shortcode('[lang_en] English goes here [/lang_en]'); ?>
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