Fix t problem for some special case
Fix t problem for some special case

Let's assume that ZF2 loaded from a .po file a plural translation string, for instance the one used in:
t2('You have one message', 'You have %s messages', $n);
If we call t against its singular form, like for instance
t('You have one message');
ZF2 will return an array.

Let's be sure we result in a string.

MichaelMaar/concrete5,TimDix/concrete5,avdevs/concrete5,matt9mg/concrete5,matt9mg/concrete5,MichaelMaar/concrete5,avdevs/concrete5,MichaelMaar/concrete5,avdevs/concrete5,TimDix/concrete5,matt9mg/concrete5,TimDix/concrete5