Add link to Sign Up on Sign In dialog

As a user, I'd like to be able to be redirected to registration form if I'm on Sign In form, but figured out that I don't have an account. This will win me some time

Acceptance Criteria

• Link should be located according mockupscreens (pup-up dialog box and Sign in page)
• Sign in Pup-up dialog box: Clicking on link to Sign Up opens Sign up dialog box and closes Sing in at the same time
• Sign in page: Clicking on link to Sign Up opens Sign up dialog box
• Translation:
  Ukrainian: Зареєструватись зараз
  Russian: Зарегистрироваться прямо сейчас
  English: Sign up right now
  Spanish: ¡Inscríbete ahora!