Added warning about license change for Oracle Java (#5)

* Added warning about license change for Oracle Java

* <f:entry> has semantic meaning, let's just use a plain html block

* Added support for i18n

src/main/resources/hudson/tools/JDKInstaller/config.jelly

@@ -47,4 +47,11 @@ THE SOFTWARE.
   <f:entry title="" field="acceptLicense">
     <f:checkbox title="${%I agree to the Java SE Development Kit License Agreement}"/>
   </f:entry>
+  <f:block>
+    <div class="warning">
+      ${%Oracle Java SE 11+ is not available for business, commercial or production use without a commercial license.}<br />
+      ${%Public updates for Oracle Java SE 8 released after January 2019 will not be available for business, commercial or production use without a commercial license.}<br />
+      <a href="https://www.oracle.com/technetwork/java/javase/overview/oracle-jdk-faqs.html" target="_blank">${%Oracle Java SE Licensing FAQ}</a><br />
+    </div>
+  </f:block>
 </j:jelly>