Max size of <g:title> should be 150 characters instead of 70

[eballetbaz]

As per Google specification the max size of <g:title> is 150 characters
Current code is truncating title to 70 characters

Google specification : https://support.google.com/merchants/answer/7052112?visit_id=638701413694932181-242874281&hl=en&rd=1