Add i18n support

Make the "Running on.." string translatable and copy the extraction and
conversion of JSX and PO files from Cockpit.

po/de.po

@@ -0,0 +1,18 @@
+# starter-kit German translations
+#, fuzzy
+msgid ""
+msgstr ""
+"Project-Id-Version: starter-kit 1.0\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2018-06-19 10:54+0200\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"Language: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+#: src/app.jsx:40
+msgid "Running on $0"
+msgstr "Läuft auf $0"

po/po.empty.js

@@ -0,0 +1,14 @@
+(function (root, data) {
+    var loaded, module;
+
+    /* Load into Cockpit locale */
+    if (typeof cockpit === 'object') {
+        cockpit.locale(data)
+        loaded = true;
+    }
+
+    if (!loaded)
+        root.po = data;
+
+/* The syntax of this line is important  by po2json */
+}(this, {"":{"language":"en"}}));

po/po2json

@@ -0,0 +1,127 @@
+#!/usr/bin/env node
+
+function fatal(message, code) {
+    console.log((filename || "html2po") + ": " + message);
+    process.exit(code || 1);
+}
+
+function usage() {
+    console.log("usage: po2json [--module=template.js] input output");
+    process.exit(2);
+}
+
+var fs, po2json, Jed, stdio;
+
+try {
+    fs = require('fs');
+    po2json = require('po2json');
+    Jed = require('jed');
+    stdio = require('stdio');
+} catch(ex) {
+    fatal(ex.message, 127); /* missing looks for this */
+}
+
+var argi = 2;
+var filename = null;
+
+var opts = stdio.getopt({
+    module: { key: "m", args: 1, description: "Module template to include" },
+    output: { key: "o", args: 1, description: "Output file" },
+});
+
+if (opts.args.length != 1) {
+    usage();
+}
+
+parse();
+
+function prepareHeader(header) {
+    var body, statement, plurals = header["plural-forms"], ret = null;
+    if (plurals) {
+        try {
+            /* Check that the plural forms isn't being sneaky since we build a function here */
+            Jed.PF.parse(plurals);
+        } catch(ex) {
+            fatal("bad plural forms: " + ex.message, 1);
+        }
+
+        /* A function for the front end */
+        statement = header["plural-forms"];
+        if (statement[statement.length - 1] != ';')
+            statement += ';';
+        ret = 'function(n) {\nvar nplurals, plural;\n' + statement + '\nreturn plural;\n}';
+
+        /* Added back in later */
+        delete header["plural-forms"];
+    }
+
+    /* We don't need to be transferring this */
+    delete header["project-id-version"];
+    delete header["report-msgid-bugs-to"];
+    delete header["pot-creation-date"];
+    delete header["po-revision-date"];
+    delete header["last-translator"];
+    delete header["language-team"];
+    delete header["mime-version"];
+    delete header["content-type"];
+    delete header["content-transfer-encoding"];
+
+    return ret;
+}
+
+/* Parse and process the po data */
+function parse() {
+    filename = opts.args[0];
+    po2json.parseFile(opts.args[0], { "fuzzy": true }, function(err, jsonData) {
+        var plurals, pos;
+
+        if (err)
+            fatal(err.message);
+
+        var header = jsonData[""];
+        if (header)
+            plurals = prepareHeader(header);
+
+        var data = JSON.stringify(jsonData, null, 1);
+
+        /* We know the brace in is the location to insert our function */
+        if (plurals) {
+            pos = data.indexOf('{', 1);
+            data = data.substr(0, pos + 1) + "'plural-forms':" + String(plurals) + "," + data.substr(pos + 1);
+        }
+
+        if (data == JSON.stringify({}))
+            finish("");
+        else
+            wrap(data);
+    });
+}
+
+/* Wrap the data if desired */
+function wrap(data) {
+    if (opts.module) {
+        filename = opts.module;
+        fs.readFile(opts.module, { encoding: "utf-8" }, function(err, template) {
+            if (err)
+                fatal(err.message);
+            data = template.replace('{"":{"language":"en"}}', data);
+            finish(data);
+        });
+    } else {
+        finish(data);
+    }
+}
+
+/* Write it out */
+function finish(data) {
+    if (opts.output) {
+        fs.writeFile(opts.output, data, function(err) {
+            if (err)
+                fatal(err.message);
+            process.exit(0);
+        });
+    } else {
+        process.stdout.write(data);
+        process.exit(0);
+    }
+}