Update etherpad.js to current version

public/js/etherpad.js

@@ -8,6 +8,7 @@
       'showChat'          : false,
       'showLineNumbers'   : false,
       'userName'          : 'unnamed',
+      'lang'              : '',
       'useMonospaceFont'  : false,
       'noColors'          : false,
       'userColor'         : false,
@@ -18,7 +19,8 @@
       'border'            : 0,
       'borderStyle'       : 'solid',
       'toggleTextOn'      : 'Disable Rich-text',
-      'toggleTextOff'     : 'Enable Rich-text'
+      'toggleTextOff'     : 'Enable Rich-text',
+      'rtl'               : false
     };
     
     var $self = this;
@@ -42,10 +44,14 @@
           iFrameLink = iFrameLink + '&showLineNumbers=' + settings.showLineNumbers;
           iFrameLink = iFrameLink + '&useMonospaceFont=' + settings.useMonospaceFont;
           iFrameLink = iFrameLink + '&userName=' + settings.userName;
+          if (settings.lang) {
+            iFrameLink = iFrameLink + '&lang=' + settings.lang;
+          }
           iFrameLink = iFrameLink + '&noColors=' + settings.noColors;
           iFrameLink = iFrameLink + '&userColor=' + settings.userColor;
           iFrameLink = iFrameLink + '&hideQRCode=' + settings.hideQRCode;
           iFrameLink = iFrameLink + '&alwaysShowChat=' + settings.alwaysShowChat;
+          iFrameLink = iFrameLink + '&rtl=' + settings.rtl;
           iFrameLink = iFrameLink +'" style="border:' + settings.border;
           iFrameLink = iFrameLink +'; border-style:' + settings.borderStyle;
           iFrameLink = iFrameLink +';" width="' + '100%';//settings.width;