implement language selector

we can now set the language in the datacenter config file,
but the value is not used (we still have no i18n)

www/manager/Makefile

@@ -32,6 +32,7 @@ JSSRC= 				                 	\
 	form/BridgeSelector.js				\
 	form/CPUModelSelector.js			\
 	form/VNCKeyboardSelector.js			\
+	form/LanguageSelector.js			\
 	form/DisplaySelector.js				\
 	form/CacheTypeSelector.js			\
 	form/ContentTypeSelector.js			\

www/manager/Utils.js

@@ -175,6 +175,31 @@ Ext.define('PVE.Utils', { statics: {
 	return data;
     },
 
+    language_map: {
+	en: 'English',
+	de: 'German'
+    },
+
+    render_language: function (value) {
+	if (!value) {
+	    return 'Default (English)';
+	}
+	var text = PVE.Utils.language_map[value];
+	if (text) {
+	    return text + ' (' + value + ')';
+	}
+	return value;
+    },
+
+    language_array: function() {
+	var data = [['', PVE.Utils.render_language('')]];
+	Ext.Object.each(PVE.Utils.language_map, function(key, value) {
+	    data.push([key, PVE.Utils.render_language(value)]);
+	});
+
+	return data;
+    },
+
     render_kvm_vga_driver: function (value) {
 	if (!value) {
 	    return 'Default';

www/manager/dc/OptionView.js

@@ -1,3 +1,25 @@
+Ext.define('PVE.dc.LanguageEdit', {
+    extend: 'PVE.window.Edit',
+
+    initComponent : function() {
+	var me = this;
+
+	Ext.applyIf(me, {
+	    title: "Edit language settings",
+	    items: {
+		xtype: 'pveLanguageSelector',
+		name: 'language',
+		value: '',
+		fieldLabel: 'Language'
+	    }
+	});
+
+	me.callParent();
+
+	me.load();
+    }
+});
+
 Ext.define('PVE.dc.KeyboardEdit', {
     extend: 'PVE.window.Edit',
 
@@ -40,6 +62,8 @@ Ext.define('PVE.dc.OptionView', {
 	    },
 	    language: { 
 		header: 'GUI language', 
+		editor: 'PVE.dc.LanguageEdit',
+		renderer: PVE.Utils.render_language,
 		required: true 
 	    },
 	    http_proxy: { 

www/manager/form/LanguageSelector.js

@@ -0,0 +1,10 @@
+Ext.define('PVE.form.LanguageSelector', {
+    extend: 'PVE.form.KVComboBox',
+    alias: ['widget.pveLanguageSelector'],
+  
+    initComponent: function() {
+	var me = this;
+	me.data = PVE.Utils.language_array();
+	me.callParent();
+    }
+});