[Plugin: All-in-One Event Calendar] Localization on widget

Reply to myself. It is possible. You should change:

<div class="ai1ec-month"><?php echo gmstrftime( '%b', $timestamp ) ?></div>
<div class="ai1ec-day"><?php echo gmstrftime( '%d', $timestamp ) ?></div>
<div class="ai1ec-weekday"><?php echo gmstrftime( '%a', $timestamp ) ?></div>

to this:

<div class="ai1ec-month"><?php echo date_i18n( 'M', $timestamp, true ) ?></div>
<div class="ai1ec-day"><?php echo date_i18n( 'j', $timestamp, true ) ?></div>
<div class="ai1ec-weekday"><?php echo date_i18n( 'D', $timestamp, true ) ?></div>

For other people…maybe it help to somebody.

Thank you