restore semester info in context title, fixes #2947

Closes #2947

Merge request studip/studip!1986

templates/header.php

@@ -292,6 +292,9 @@ if ($navigation) {
                     <? if (Context::isCourse()) : ?>
                         <?= Icon::create('seminar', Icon::ROLE_INFO)->asImg(20, ['class' => 'context_icon']) ?>
                         <?= htmlReady(Context::get()->getFullname()) ?>
+                        <? if ($GLOBALS['user']->config->SHOWSEM_ENABLE && !Context::get()->isOpenEnded()): ?>
+                            (<?= htmlReady(Context::get()->getTextualSemester()) ?>)
+                        <? endif ?>
                     <? elseif (Context::isInstitute()) : ?>
                         <?= Icon::create('institute', Icon::ROLE_INFO)->asImg(20, ['class' => 'context_icon']) ?>
                         <?= htmlReady(Context::get()->name) ?>