Language selection combobox in options and accepted languages.

Added language selection combobox in options dialog. Selecting
language here will overwrite language code gathered from system.

Added AcceptedLanguages map to Translator, which holds readable
names and lang-country codes with avaailable languages. Filled
it with languages in which URTrator already translated. Francais
coming :)

ui/gtk2/options.go

@@ -36,6 +36,9 @@ type OptionsDialog struct {
     show_tray_icon *gtk.CheckButton
     // Enable autoupdate checkbutton.
     autoupdate *gtk.CheckButton
+    // Appearance tab.
+    // Language to use.
+    language_combo *gtk.ComboBoxText
     // Urban Terror tab.
     // Profiles list.
     profiles_list *gtk.TreeView
@@ -73,6 +76,7 @@ func (o *OptionsDialog) closeOptionsDialogWithSaving() {
     fmt.Println("Saving changes to options...")
 
     o.saveGeneral()
+    o.saveAppearance()
 
     // Temporary disable all these modals on Linux.
     // See https://github.com/mattn/go-gtk/issues/289.
@@ -167,9 +171,32 @@ func (o *OptionsDialog) fill() {
 func (o *OptionsDialog) initializeAppearanceTab() {
     appearance_vbox := gtk.NewVBox(false, 0)
 
-    l := gtk.NewLabel(ctx.Translator.Translate("There will be some appearance configuration options soon.", nil))
-    appearance_vbox.PackStart(l, false, true, 5)
+    appearance_table := gtk.NewTable(1, 2, false)
 
+    language_selection_tooltip := ctx.Translator.Translate("Language which URTrator will use.\n\nChanging this requires URTrator restart!", nil)
+
+    language_selection_label := gtk.NewLabel(ctx.Translator.Translate("Language:", nil))
+    language_selection_label.SetAlignment(0, 0)
+    language_selection_label.SetTooltipText(language_selection_tooltip)
+    appearance_table.Attach(language_selection_label, 0, 1, 0, 1, gtk.FILL, gtk.SHRINK, 5, 5)
+
+    o.language_combo = gtk.NewComboBoxText()
+    o.language_combo.SetTooltipText(language_selection_tooltip)
+    // Get all available languages and fill combobox.
+    lang_idx := 0
+    var lang_active int = 0
+    for lang, _ := range ctx.Translator.AcceptedLanguages {
+        o.language_combo.AppendText(lang)
+        if ctx.Translator.AcceptedLanguages[lang] == ctx.Cfg.Cfg["/general/language"] {
+            lang_active = lang_idx
+        }
+        lang_idx += 1
+    }
+    o.language_combo.SetActive(lang_active)
+
+    appearance_table.Attach(o.language_combo, 1, 2, 0, 1, gtk.FILL, gtk.FILL, 5, 5)
+
+    appearance_vbox.PackStart(appearance_table, false, true, 0)
     o.tab_widget.AppendPage(appearance_vbox, gtk.NewLabel(ctx.Translator.Translate("Appearance", nil)))
 }
 
@@ -344,6 +371,10 @@ func (o *OptionsDialog) loadProfiles(data map[string]string) {
     }
 }
 
+func (o *OptionsDialog) saveAppearance() {
+    ctx.Cfg.Cfg["/general/language"] = ctx.Translator.AcceptedLanguages[o.language_combo.GetActiveText()]
+}
+
 func (o *OptionsDialog) saveGeneral() {
     if o.show_tray_icon.GetActive() {
         ctx.Cfg.Cfg["/general/show_tray_icon"] = "1"