remove unnecessary translation key

customize.dist/Header.html

@@ -13,7 +13,7 @@
       <p><a id="cryptpad-logo" class="small" href="/" data-localization-title="header_logoTitle"><img src="/customize/cryptofist_mini.png" alt="Cryptpad" class="cryptofist" /></a></p>
     </div>
     <div class="bottom-bar-right">
-      <p data-localization="header_xwiki" class="small">
+      <p class="small">
           <a href="http://www.xwiki.com/" target="_blank" rel="noopener noreferrer"><img src="/customize/logo-xwiki.png" alt="XWiki SAS" class="bottom-bar-xwiki"/></a>
       <p data-localization="header_support" class="big">
       </p>

customize.dist/translations/messages.fr.js

@@ -215,7 +215,6 @@ define(function () {
     // Header.html
 
     out.header_france = '<a href="http://www.xwiki.com/fr" target="_blank" rel="noopener noreferrer">Fait avec <img class="bottom-bar-heart" src="/customize/heart.png" /> en <img class="bottom-bar-fr" title="France" alt="France" src="/customize/fr.png" /> par <img src="/customize/logo-xwiki.png" alt="XWiki SAS" class="bottom-bar-xwiki"/></a>';
-    out.header_xwiki = '<a href="http://www.xwiki.com/fr" target="_blank" rel="noopener noreferrer"><img src="/customize/logo-xwiki.png" alt="XWiki SAS" class="bottom-bar-xwiki"/></a>';
     out.header_support = '<a href="http://ng.open-paas.org/" title="OpenPaaS::ng" target="_blank" rel="noopener noreferrer"> <img src="/customize/openpaasng.png" alt="OpenPaaS-ng" class="bottom-bar-openpaas" /></a>';
     out.header_logoTitle = "Aller vers la page d'accueil";