Hold on

Of course polylang doesn’t translate by itself. I ment that predefined translation can’t be shown by switching to another language.

I had popup domination plugin (v2.0) that did not worked with wp 3.6.1 . After I uninstalled it, I don’t see that easy-modal warning … Strange things…

Yep. Got same thing (only on top):
Warning: session_start() [function.session-start]: Cannot send session cache limiter – headers already sent (output started at /home/bh45849/public_html/wp-includes/general-template.php:2135) in /home/bh45849/public_html/wp-content/plugins/easy-modal/easy-modal.php on line 909

wp 3.6.1 easymodal 1.3.0.3