enable header extension by default

src/assets/app.extensions.json

@@ -7,7 +7,9 @@
   "$license": "LGPL-3.0",
   "$runtime": "1.5.0",
   "$description": "Core application extensions and features",
-  "$references": [],
+  "$references": [
+    "app.header.json"
+  ],
 
   "rules": [
     {

src/assets/i18n/en.json

@@ -23,7 +23,7 @@
           "VALUE": "Value"
         },
         "MODULES": {
-          "TITLE": "Modules",
+          "TITLE": "Alfresco platform modules",
           "ID": "ID",
           "NAME": "Name",
           "VERSION": "Version"