OPENNLP-1070: Add fixed locale to freemaker

closes apache/opennlp-site#16
diff --git a/src/main/jbake/templates/feed.ftl b/src/main/jbake/templates/feed.ftl
index 02ff7ba..00c62af 100755
--- a/src/main/jbake/templates/feed.ftl
+++ b/src/main/jbake/templates/feed.ftl
@@ -17,6 +17,9 @@
    specific language governing permissions and limitations
    under the License. 
 -->
+<#setting date_format="dd-MM-yyyy">
+<#setting locale="en_US">
+<#setting time_zone="GMT">
 <rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
   <channel>
     <title>Apache OpenNLP</title>
diff --git a/src/main/jbake/templates/header.ftl b/src/main/jbake/templates/header.ftl
index fdd435e..b168700 100755
--- a/src/main/jbake/templates/header.ftl
+++ b/src/main/jbake/templates/header.ftl
@@ -17,6 +17,9 @@
    specific language governing permissions and limitations
    under the License. 
 -->
+<#setting date_format="dd-MM-yyyy">
+<#setting locale="en_US">
+<#setting time_zone="GMT">
 <html lang="en">
 <head>
     <meta charset="utf-8">