Update _s.pot
Update _s.pot

Change "Posted on" string.
And add "by" string.
Related: #453, e24e53e

madeso-uk/vcsassist,carl-alberto/business-portfolio,jchck/jchck_,andbaz/launchbaz,madeso-uk/vcsassist,vaishaliagola27/_s,vaishaliagola27/_s,andbaz/launchbaz,jchck/jchck_,carl-alberto/business-portfolio,vaishaliagola27/_s