replace t() with DateHelper
replace t() with DateHelper

Translation of strings inside dates (monthnames, daynames) should be handled through the DateHelper instead of t().
http://docs.mnkras.com/class_concrete5___helper___date.html#a5f7a7453c70e203543e5e0ab057e3ae5
Former-commit-id: 0d950241e5942244dcd43bcd8c8f9e5af67a2c9b
KorvinSzanto/concrete5,mlocati/concrete5,hissy/concrete5,biplobice/concrete5,triplei/concrete5-8,rikzuiderlicht/concrete5,MrKarlDilkington/concrete5,olsgreen/concrete5,a3020/concrete5,biplobice/concrete5,deek87/concrete5,mlocati/concrete5,a3020/concrete5,deek87/concrete5,olsgreen/concrete5,MrKarlDilkington/concrete5,haeflimi/concrete5,concrete5/concrete5,hissy/concrete5,hissy/concrete5,deek87/concrete5,hissy/concrete5,haeflimi/concrete5,triplei/concrete5-8,deek87/concrete5,acliss19xx/concrete5,jaromirdalecky/concrete5,olsgreen/concrete5,jaromirdalecky/concrete5,jaromirdalecky/concrete5,rikzuiderlicht/concrete5,haeflimi/concrete5,biplobice/concrete5,mainio/concrete5,jaromirdalecky/concrete5,acliss19xx/concrete5,acliss19xx/concrete5,mainio/concrete5,concrete5/concrete5,KorvinSzanto/concrete5,concrete5/concrete5,KorvinSzanto/concrete5,triplei/concrete5-8,haeflimi/concrete5,mainio/concrete5,mlocati/concrete5,biplobice/concrete5,concrete5/concrete5,MrKarlDilkington/concrete5,mlocati/concrete5,rikzuiderlicht/concrete5