Accents problem into the VAR translation

[Denys06]

Hello, I wanted to change the display text  product availability in product.tpl, why I replaced the original code with these lines:

 

var availableLaterValue = '{l s='On Backorder Availability'}';

whose translation is equivalent to : En précommande

 

aavailable_date['date_formatted'] = '{l s='Pre-order until'} {dateFormat date=$product->available_date full=false})';

whose translation is equivalent to : En pré-commande (prévue le 01/08/2014)

My problem is that for these translations used in variables, the use of accents bug. For example, for the second line of code the result on my site is :

 

En pré-commande (prévue le 01/08/2014)
 

How to modify the code for well translate the accents please?
Thank you in advance for your help