#define g_CTextStringManager ((CTextStringManager*)0x00EEDE90)
std::wstring test = g_CTextStringManager->GetString(L"UIC_STT_FONTNAME");

// ...

std::wstring CTextStringManager::GetString(wchar_t *identifier) {

    printf("Request: %S\n", identifier);
    printf("%x\n", this);

    return ((std::wstring (__thiscall*)(CTextStringManager*, wchar_t*))0x008C9C30)(this, identifier);
}