use system language by default

electrum/gui/qt/__init__.py

@@ -38,7 +38,7 @@ from PyQt5.QtWidgets import *
 from PyQt5.QtCore import *
 import PyQt5.QtCore as QtCore
 
-from electrum.i18n import _, set_language
+from electrum.i18n import _, set_language, get_default_language
 from electrum.plugin import run_hook
 from electrum.storage import WalletStorage
 from electrum.base_wizard import GoBack
@@ -89,7 +89,7 @@ class QNetworkUpdatedSignalObject(QObject):
 class ElectrumGui(PrintError):
 
     def __init__(self, config, daemon, plugins):
-        set_language(config.get('language'))
+        set_language(config.get('language', get_default_language()))
         # Uncomment this call to verify objects are being properly
         # GC-ed when windows are closed
         #network.add_jobs([DebugMem([Abstract_Wallet, SPV, Synchronizer,

electrum/i18n.py

@@ -26,6 +26,8 @@ import os
 
 import gettext
 
+from PyQt5.QtCore import QLocale
+
 LOCALE_DIR = os.path.join(os.path.dirname(__file__), 'locale')
 language = gettext.translation('electrum', LOCALE_DIR, fallback=True)
 
@@ -41,6 +43,11 @@ def set_language(x):
         language = gettext.translation('electrum', LOCALE_DIR, fallback=True, languages=[x])
 
 
+def get_default_language():
+    system_locale = QLocale.system().name()
+    return languages.get(system_locale, 'en_UK')
+
+
 languages = {
     '': _('Default'),
     'ar_SA': _('Arabic'),