[i18n] Try to read the language from settings at startup

Fallback to system default

app/main.cpp

@@ -83,7 +83,9 @@ int main(int argc, char** argv)
 
     Log::configure(true, false, 0);
 
-    QString lang = QLocale::system().name().split('_').first();
+    QSettings settings;
+    QString lang = settings.value(QSETTINGS_LANGUAGE_PREFERENCE,
+                                  QLocale::system().name().split('_').first()).toString();
     if(argc > 1) {
         lang = QString(argv[1]);
     }

detiq-t @ 39b6dc92

-Subproject commit 7993306f08e8a856aefa63493b7c604402dfe8ca
+Subproject commit 39b6dc92311aee3fa6e057ef903e5420c194bd0f