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.


Former-commit-id: 4a7dec94f74785b4116d8eb9ee3ccd36630d2f9c
mainio/concrete5,mlocati/concrete5,jaromirdalecky/concrete5,rikzuiderlicht/concrete5,jaromirdalecky/concrete5,olsgreen/concrete5,acliss19xx/concrete5,KorvinSzanto/concrete5,hissy/concrete5,rikzuiderlicht/concrete5,a3020/concrete5,MrKarlDilkington/concrete5,haeflimi/concrete5,deek87/concrete5,biplobice/concrete5,concrete5/concrete5,deek87/concrete5,hissy/concrete5,biplobice/concrete5,haeflimi/concrete5,MrKarlDilkington/concrete5,rikzuiderlicht/concrete5,concrete5/concrete5,hissy/concrete5,deek87/concrete5,mlocati/concrete5,MrKarlDilkington/concrete5,olsgreen/concrete5,a3020/concrete5,KorvinSzanto/concrete5,jaromirdalecky/concrete5,mlocati/concrete5,concrete5/concrete5,olsgreen/concrete5,mainio/concrete5,triplei/concrete5-8,triplei/concrete5-8,haeflimi/concrete5,acliss19xx/concrete5,acliss19xx/concrete5,biplobice/concrete5,KorvinSzanto/concrete5,mlocati/concrete5,jaromirdalecky/concrete5,deek87/concrete5,concrete5/concrete5,haeflimi/concrete5,triplei/concrete5-8,mainio/concrete5,biplobice/concrete5,hissy/concrete5