EsI18nManager usage

//< In main project file
extern "C" int FMXmain()
{
  try
  {
    Application->Initialize();

    static const UnicodeString sc_localePath =
      IncludeTrailingPathDelimiter(
        System::Ioutils::TPath::GetDocumentsPath()
      );

    EsI18nManager::langFileLoad(
      "ru",
      sc_localePath
    );

  // ...


// Form header
class TFrmMain : public TForm
{
private:
  class I18nHandler: public EsI18nSubscriberIntf
  {
  public:
    I18nHandler(TFrmMain& owner);

    virtual void onLangChanged(const UnicodeString& lang);

  private:
    TFrmMain& m_owner;
  };
  friend class I18nHandler;

  // ....


// Form implementation
//
TFrmMain::I18nHandler::I18nHandler(TFrmMain& owner):
EsI18nSubscriberIntf(),
m_owner(owner)
{}
//---------------------------------------------------------------------------

void TFrmMain::I18nHandler::onLangChanged(const UnicodeString& lang)
{
  m_owner.m_textUpdatePending = true;

  m_owner.actions_->langCodeSet(lang);
  if( m_owner.Active )
    m_owner.textUpdate();
}
//---------------------------------------------------------------------------

__fastcall TFrmMain::TFrmMain(TComponent* Owner) :
TForm(Owner),
m_i18n(*this),
m_textUpdatePending(true)
{
  /// ....

void TFrmMain::textUpdate()
{
  if( !m_textUpdatePending )
    return;

  m_textUpdatePending = false;

  grpMain_->Text = _("Main");

  itemCalc_->Text = _("Soap Calculator");
  itemCalc_->ItemData->Detail = _("Create your own soap brew...");

  itemRecipes_->Text = _("Recipes");
  itemRecipes_->ItemData->Detail = _("Browse soap recipes...");

  grpExtra_->Text = _("Extras");

  //...

void __fastcall TFrmMain::FormActivate(TObject *Sender)
{
  textUpdate();

  // ...