Backport from !587

interface/web/strengthmeter/lib/lang/it_strengthmeter.lng

 <?php
 $wb['password_strength_0_txt'] = 'Troppo corta';
 $wb['password_strength_1_txt'] = 'Debole';
-$wb['password_strength_2_txt'] = 'Fair';
+$wb['password_strength_2_txt'] = 'Accettabile';
 $wb['password_strength_3_txt'] = 'Buona';
 $wb['password_strength_4_txt'] = 'Forte';
 $wb['password_strength_5_txt'] = 'Molto forte';