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 :)

translator/translator.go

@@ -23,6 +23,8 @@ import (
 )
 
 type Translator struct {
+    // Accepted languages.
+    AcceptedLanguages map[string]string
     // Currently active language.
     Language string
     // Translations.
@@ -59,6 +61,13 @@ func (t *Translator) formatFromMap(data string, params map[string]string) string
 func (t *Translator) Initialize() {
     fmt.Println("Initializing translations...")
 
+    t.AcceptedLanguages = map[string]string{
+        "System's default language": "default",
+        "English": "en_US",
+        "French": "fr_FR",
+        "Russian": "ru_RU",
+    }
+
     // Initialize storages.
     t.translations = make(map[string]map[string]string)
     t.translationsPath = ""
@@ -85,11 +94,20 @@ func (t *Translator) loadTranslations() {
     t.translations[t.Language] = make(map[string]string)
 
     if t.translationsPath != "" {
-        files_list, _ := ioutil.ReadDir(t.translationsPath)
+        // Check if language was selected in options dialog. In that
+        // case it will overwrite autodetected language.
+        var translationsDir string = ""
+        if cfg.Cfg["/general/language"] != "" {
+            translationsDir = filepath.Join(t.translationsPath, cfg.Cfg["/general/language"])
+            t.Language = cfg.Cfg["/general/language"]
+        } else {
+            translationsDir = filepath.Join(t.translationsPath, t.Language)
+        }
+        files_list, _ := ioutil.ReadDir(translationsDir)
         if len(files_list) > 0 {
             for i := range files_list {
                 // Read file.
-                file_path := filepath.Join(t.translationsPath, files_list[i].Name())
+                file_path := filepath.Join(translationsDir, files_list[i].Name())
                 file_data, _ := ioutil.ReadFile(file_path)
                 var trans map[string]string
                 json.Unmarshal(file_data, &trans)