Fix translation of "unauthorized.html" Web page

Make this page message translatable as other parts of IPA framework.

Fixes: https://pagure.io/freeipa/issue/7640
Reviewed-By: Petr Vobornik <pvoborni@redhat.com>
Reviewed-By: Serhii Tsymbaliuk <stsymbal@redhat.com>

install/html/unauthorized.html

@@ -5,11 +5,46 @@
     <title>IPA: Identity Policy Audit</title>
     <script type="text/javascript" src="../ui/js/libs/loader.js"></script>
     <script type="text/javascript">
+        var dojoConfig = {
+            baseUrl: "../ui/js",
+            has: {
+                'dojo-firebug': false,
+                'dojo-debug-messages': true
+            },
+            parseOnLoad: false,
+            async: true,
+            packages: [
+                {
+                    name:'dojo',
+                    location:'dojo'
+                },
+                {
+                    name: 'freeipa',
+                    location: 'freeipa'
+                }
+            ]
+        };
         (function() {
             var styles = [
                 '../ui/css/patternfly.css',
                 '../ui/css/ipa.css'
             ];
+            var scripts = [
+                '../ui/js/libs/jquery.js',
+                '../ui/js/dojo/dojo.js'
+            ];
+
+            ipa_loader.scripts(scripts, function() {
+                require([
+                    'dojo/dom',
+                    'freeipa/text',
+                    'dojo/domReady!'],
+                    function(dom, text) {
+                        if (msg = text.get('@i18n:unauthorized-page')) {
+                            dom.byId('unauthorized-msg').innerHTML=msg;
+                        }
+                    });
+            });
             ipa_loader.styles(styles);
         })();
     </script>
@@ -26,6 +61,8 @@
     <div class="container-fluid">
     <div class="row">
     <div class="col-sm-12">
+    <div id="unauthorized-msg">
+    <noscript>
 
         <h1>Unable to verify your Kerberos credentials</h1>
         <p>
@@ -39,6 +76,8 @@
                 If this is your first time, please <a href="ssbrowser.html">configure your browser</a>.
             </p>
         </div>
+    </noscript>
+    </div>
     </div>
     </div>
     </div>

ipaserver/plugins/internal.py

@@ -998,6 +998,23 @@ class i18n_messages(Command):
             "trust": _("Trusts"),
         },
         "true": _("True"),
+        "unauthorized-page": _(
+            "<h1>Unable to verify your Kerberos credentials</h1>\n"
+            "<p>\n"
+            "            Please make sure that you have valid Kerberos "
+            "tickets (obtainable via <strong>kinit</strong>), and that you"
+            " have configured your browser correctly.\n"
+            "</p>\n"
+            "\n"
+            "<h2>Browser configuration</h2>\n"
+            "\n"
+            "<div id=\"first-time\">\n"
+            "<p>\n"
+            "                If this is your first time, please <a href="
+            "\"ssbrowser.html\">configure your browser</a>.\n"
+            "</p>\n"
+            "</div>\n"
+        ),
         "widget": {
             "api_browser": _("API Browser"),
             "first": _("First"),