fix(src/app/App): do not create linphone config when prefered language is fetched

linphone-desktop/src/app/App.cpp

@@ -83,7 +83,7 @@ App::App (int &argc, char *argv[]) : SingleApplication(argc, argv, true) {
   // Try to use preferred locale.
   QString locale = ::Utils::coreStringToAppString(
       linphone::Config::newWithFactory(
-        Paths::getConfigFilePath(mParser.value("config")), "")->getString(
+        Paths::getConfigFilePath(mParser.value("config"), false), "")->getString(
         SettingsModel::UI_SECTION, "locale", ""
       )
     );

linphone-desktop/src/app/paths/Paths.cpp

@@ -175,11 +175,12 @@ string Paths::getCapturesDirPath () {
   return getWritableDirPath(QStandardPaths::writableLocation(QStandardPaths::AppLocalDataLocation) + PATH_CAPTURES);
 }
 
-string Paths::getConfigFilePath (const QString &configPath) {
-  if (!configPath.isEmpty())
-    return getWritableFilePath(QFileInfo(configPath).absoluteFilePath());
+string Paths::getConfigFilePath (const QString &configPath, bool writable) {
+  const QString &path = configPath.isEmpty()
+    ? getAppConfigFilePath()
+    : QFileInfo(configPath).absoluteFilePath();
 
-  return getWritableFilePath(getAppConfigFilePath());
+  return writable ? getWritableFilePath(path) : getReadableFilePath(path);
 }
 
 string Paths::getFactoryConfigFilePath () {

linphone-desktop/src/app/paths/Paths.hpp

@@ -36,7 +36,7 @@ namespace Paths {
   std::string getAvatarsDirPath ();
   std::string getCallHistoryFilePath ();
   std::string getCapturesDirPath ();
-  std::string getConfigFilePath (const QString &configPath = QString());
+  std::string getConfigFilePath (const QString &configPath = QString(), bool writable = true);
   std::string getFactoryConfigFilePath ();
   std::string getFriendsListFilePath ();
   std::string getDownloadDirPath ();