bug#31273: 27.0.50; org: #+begin_right block is not exported correctly

[Dmitry Alexandrov]

Dear maintainers,

with the latest Emacs from git master, exporting #+begin_right block
neither to HTML, nor to ODT (didn’t test other options) does not work
as expected, while this should be pretty possible with both.

With HTML, as far as I can see, the problem is in that, so a CSS class
is named ‘org-right’:

--8<---------------cut here---------------start------------->8---
  .org-right  { margin-left: auto; margin-right: 0px;  text-align: right; }
--8<---------------cut here---------------end--------------->8---

while in the HTML it is referenced as just ‘right’:

--8<---------------cut here---------------start------------->8---
<div class="right">
--8<---------------cut here---------------end--------------->8---

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