Update credits (#1451)

Fixes #1450 

Thanks @Kenny2github 

src/views/credits/credits.jsx

@@ -28,8 +28,8 @@ var Credits = React.createClass({
                     </li>
                     
                     <li>
-                        <img src="//cdn.scratch.mit.edu/get_image/user/4598206_170x170.png" alt="Kasia Avatar" />
-                        <span className="name">Kasia Chmielinski</span>
+                        <img src="//cdn.scratch.mit.edu/get_image/user/900283_170x170.png" alt="Champika Avatar" />
+                        <span className="name">Champika Fernando</span>
                     </li>
                     
                     <li>
@@ -51,11 +51,6 @@ var Credits = React.createClass({
                         <img src="//cdn.scratch.mit.edu/get_image/user/21986973_170x170.png" alt="Paul Avatar" />
                         <span className="name">Paul Kaplan</span>
                     </li>
-                    
-                    <li>
-                        <img src="//cdn.scratch.mit.edu/get_image/user/2752403_170x170.png" alt="Saskia Avatar" />
-                        <span className="name">Saskia Leggett</span>
-                    </li>
                                         
                     <li>
                         <img src="//cdn.scratch.mit.edu/get_image/user/527836_170x170.png" alt="DD Avatar" />
@@ -195,7 +190,6 @@ var Credits = React.createClass({
                 <p><FormattedHTMLMessage id='credits.acknowledgementsContributors' /></p>
                 <p><FormattedMessage id='credits.acknowledgementsCommunity' /></p>
                 <p><FormattedMessage id='credits.acknowledgementsInfluencers' /></p>
-
                 <h2><FormattedMessage id='credits.supportersTitle' /></h2>
                 <p><FormattedMessage id='credits.supportersFinancialHeader' /></p>
                 <p>

src/views/credits/l10n.json

@@ -3,7 +3,7 @@
   "credits.developers": "Scratch is designed and developed by the Lifelong Kindergarten Group at MIT Media Lab:",
   "credits.moderators": "The team of Scratch moderators manages, supports, and improves the Scratch online community:",
   "credits.previousTitle": "Previous MIT Scratch Team Members",
-  "credits.previousBody": "Many important contributions have been made by previous Scratch Team members, including John Maloney (who led software development for the first decade of Scratch), Andrés Monroy-Hernández (who led the development of the first Scratch community website), Ben Berg, Amos Blanton, Karen Brennan, Juanita Buitrago, Leo Burd, Gaia Carini, Michelle Chung, Shane Clements, Hannah Cole, Sayamindu Dasgupta, Margarita Dekoli, Evelyn Eastmond, Dave Feinberg, Champika Fernando, Chris Graves, Megan Haddadi, Christina Huang, Tony Hwang, Abdulrahman Idlbi, Randy Jou, Di Liu, Tim Mickel, Amon Millner, Ricarose Roque, Andrea Saxman, Jay Silver, Tammy Stern, Lis Sylvan, Claudia Urrea, and Oren Zuckerman.",
+  "credits.previousBody": "Many important contributions have been made by previous Scratch Team members, including John Maloney (who led software development for the first decade of Scratch), Andrés Monroy-Hernández (who led the development of the first Scratch community website), Ben Berg, Amos Blanton, Karen Brennan, Juanita Buitrago, Leo Burd, Gaia Carini, Kasia Chmielinski, Michelle Chung, Shane Clements, Hannah Cole, Sayamindu Dasgupta, Margarita Dekoli, Evelyn Eastmond, Dave Feinberg, Chris Graves, Megan Haddadi, Christina Huang, Tony Hwang, Abdulrahman Idlbi, Randy Jou, Saskia Leggett, Tim Mickel, Amon Millner, Ricarose Roque, Andrea Saxman, Jay Silver, Tammy Stern, Lis Sylvan, Claudia Urrea, and Oren Zuckerman",
   "credits.partnersTitle": "Design and Development Partners",
   "credits.partnersBody": "Paula Bontá and Brian Silverman, Playful Invention Company (who started contributing to the design of Scratch even before it was called Scratch).",
   "credits.researchersTitle": "Scratch Researchers",