i18n: implement LocaleSettings, use wx.GetTranslation instead of gettext

(cherry picked from commit 3648a5c8c7b230a4b695a29ebfaad3877e7b644f)

service/settings.py

@@ -22,6 +22,7 @@ import os.path
 import urllib.request
 import urllib.error
 import urllib.parse
+import wx
 
 from logbook import Logger
 
@@ -533,3 +534,26 @@ class GraphSettings:
 
     def set(self, type, value):
         self.settings[type] = value
+
+
+class LocaleSettings:
+    _instance = None
+
+    @classmethod
+    def getInstance(cls):
+        if cls._instance is None:
+            cls._instance = LocaleSettings()
+        return cls._instance
+
+    def __init__(self):
+
+        defaults = {
+            'locale': wx.LANGUAGE_DEFAULT
+        }
+        self.settings = SettingsProvider.getInstance().getSettings('localeSettings', defaults)
+
+    def get(self, key):
+        return self.settings[key]
+
+    def set(self, key, value):
+        self.settings[key] = value