Set correct GWT .dtd definition (#11110)

client/src/main/resources/com/vaadin/DefaultWidgetSet.gwt.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.1//EN" "http://gwtproject.org/doctype/2.8.1/gwt-module.dtd">
+<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.2//EN" "http://www.gwtproject.org/doctype/2.8.2/gwt-module.dtd">
 <module>
     <!-- This GWT module defines the Vaadin DefaultWidgetSet. This is the module
         you want to extend when creating an extended widget set, or when creating

client/src/main/resources/com/vaadin/Vaadin.gwt.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.1//EN" "http://gwtproject.org/doctype/2.8.1/gwt-module.dtd">
+<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.2//EN" "http://www.gwtproject.org/doctype/2.8.2/gwt-module.dtd">
 <module>
     <!-- This GWT module inherits all Vaadin client side functionality modules.
         This is the module you want to inherit in your client side project to be

compatibility-client/src/main/resources/com/vaadin/v7/Vaadin7WidgetSet.gwt.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.1//EN" "http://gwtproject.org/doctype/2.8.1/gwt-module.dtd">
+<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.2//EN" "http://www.gwtproject.org/doctype/2.8.2/gwt-module.dtd">
 <module>
     <!-- Hint for WidgetSetBuilder not to automatically update the file -->
     <!-- WS Compiler: manually edited -->

documentation/clientside/clientside-module.asciidoc

 
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE module PUBLIC
-  "-//Google Inc.//DTD Google Web Toolkit 2.8.1//EN"
-  "http://gwtproject.org/doctype/2.8.1/gwt-module.dtd">
+  "-//Google Inc.//DTD Google Web Toolkit 2.8.2//EN"
+  "http://www.gwtproject.org/doctype/2.8.2/gwt-module.dtd">
 
 <module>
     <!-- Inherit the default widget set -->

server/src/main/java/com/vaadin/server/widgetsetutils/WidgetSetBuilder.java

             try (PrintStream printStream = new PrintStream(
                     new FileOutputStream(widgetsetFile))) {
                 printStream.print("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"
-                        + "<!DOCTYPE module PUBLIC \"-//Google Inc.//DTD Google Web Toolkit 2.8.1//EN\" \"http://gwtproject.org/doctype/2.8.1/gwt-module.dtd\">\n");
+                        + "<!DOCTYPE module PUBLIC \"-//Google Inc.//DTD Google Web Toolkit 2.8.2//EN\" \"http://www.gwtproject.org/doctype/2.8.2/gwt-module.dtd\">\n");
                 printStream.print("<module>\n");
                 printStream.print("    <!--\n"
                         + "     Uncomment the following to compile the widgetset for one browser only.\n\n"

test/addon-using-own-widget-set/src/main/resources/com/vaadin/test/addonusingownwidgetset/AddonUsingOwnWidgetSet.gwt.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.1//EN" "http://gwtproject.org/doctype/2.8.1/gwt-module.dtd">
+<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.2//EN" "http://www.gwtproject.org/doctype/2.8.2/gwt-module.dtd">
 <module>
     <inherits name="com.vaadin.DefaultWidgetSet" />
 

test/own-widget-set/src/main/resources/com/vaadin/test/ownwidgetset/OwnWidgetSet.gwt.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.1//EN" "http://gwtproject.org/doctype/2.8.1/gwt-module.dtd">
+<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.2//EN" "http://www.gwtproject.org/doctype/2.8.2/gwt-module.dtd">
 <module>
     <inherits name="com.vaadin.DefaultWidgetSet" />
 </module>

test/space in directory/src/main/resources/com/vaadin/test/spaceindirectory/SpaceInDirectory.gwt.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.1//EN" "http://gwtproject.org/doctype/2.8.1/gwt-module.dtd">
+<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.2//EN" "http://www.gwtproject.org/doctype/2.8.2/gwt-module.dtd">
 <module>
     <inherits name="com.vaadin.DefaultWidgetSet" />
 </module>

test/vaadinservletconfiguration-widget-set/src/main/resources/com/vaadin/test/vaadinservletconfigurationwidgetset/VaadinServletConfigurationWidgetSet.gwt.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.1//EN" "http://gwtproject.org/doctype/2.8.1/gwt-module.dtd">
+<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.2//EN" "http://www.gwtproject.org/doctype/2.8.2/gwt-module.dtd">
 <module>
     <inherits name="com.vaadin.DefaultWidgetSet" />
 </module>

uitest/src/main/resources/com/vaadin/tests/widgetset/TestingWidgetSet.gwt.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.1//EN" "http://gwtproject.org/doctype/2.8.1/gwt-module.dtd">
+<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 2.8.2//EN" "http://www.gwtproject.org/doctype/2.8.2/gwt-module.dtd">
 <module>
     <!-- WS Compiler: manually edited -->