i18n strings and ts() usage fix for Contribute PCP strings

ts fixes for CRM/Contribute/Form/Contribution/Main.php :

• $pcp_supporter_text = ts('This contribution is being made thanks to effort of <strong>%1</strong>, who supports our campaign. ', array(1 => $pcpSupporter));
  + $pcp_supporter_text = ts('This contribution is being made thanks to the effort of <strong>%1</strong>, who supports our campaign.', array(1 => $pcpSupporter));

(above string had a space at the end of the string, confusing for word replacements)

• $pcp_supporter_text .= "You can support it as well - once you complete the donation, you will be able to create your own Personal Campaign Page!";
  + $pcp_supporter_text .= ts("You can support it as well - once you complete the donation, you will be able to create your own Personal Campaign Page!");

(was missing ts)