Объявления

<span class="multilang" lang="ru"><a href="https://courses.bsuir.by/login/signup.php?"><button type="button" class="btn btn-primary">Зарегистрироваться в системе</button></a></span>

<span class="multilang" lang="eng"><a href="https://courses.bsuir.by/login/signup.php?"><button type="button" class="btn btn-primary">Register</button></a></span>
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<a href="https://courses.bsuir.by/customforms/index.html"><button type="button" class="btn btn-primary">Регистрация в курсе</button></a>
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