Add aria label for icon buttons

Those labels allow description to be associated with buttons and to be read by screen readers

main/inc/lib/course.lib.php

@@ -4849,7 +4849,7 @@ class CourseManager
                 $my_course['already_register_as'] = Display::tag(
                     'button',
                     $icon,
-                    array('id' => 'register', 'class' => 'btn btn-default btn-sm', 'title' => $title)
+                    array('id' => 'register', 'class' => 'btn btn-default btn-sm', 'title' => $title, 'aria-label' => $title)
                 );
             } elseif ($user_registerd_in_course_as_teacher) {
                 // if user registered as teacher
@@ -4858,7 +4858,7 @@ class CourseManager
                 $my_course['already_register_as'] = Display::tag(
                     'button',
                     $icon,
-                    array('id' => 'register', 'class' => 'btn btn-default btn-sm', 'title' => $title)
+                    array('id' => 'register', 'class' => 'btn btn-default btn-sm', 'title' => $title, 'aria-label' => $title)
                 );
             }
 
@@ -4867,7 +4867,7 @@ class CourseManager
                 $my_course['register_button'] = Display::url(
                     Display::returnFontAwesomeIcon('sign-in'),
                     api_get_path(WEB_COURSE_PATH) . $course_info['path'] . '/index.php?action=subscribe&sec_token=' . $stok,
-                    array('class' => 'btn btn-success btn-sm', 'title' => get_lang('Subscribe')));
+                    array('class' => 'btn btn-success btn-sm', 'title' => get_lang('Subscribe'), 'aria-label' => get_lang('Subscribe')));
             }
 
             if ($access_link && in_array('enter',
@@ -4876,14 +4876,14 @@ class CourseManager
                 $my_course['go_to_course_button'] = Display::url(
                     Display::returnFontAwesomeIcon('share'),
                     api_get_path(WEB_COURSE_PATH) . $course_info['path'] . '/index.php',
-                    array('class' => 'btn btn-default btn-sm', 'title' => get_lang('GoToCourse')));
+                    array('class' => 'btn btn-default btn-sm', 'title' => get_lang('GoToCourse'), 'aria-label' => get_lang('GoToCourse')));
             }
 
             if ($access_link && in_array('unsubscribe', $access_link)) {
                 $my_course['unsubscribe_button'] = Display::url(
                     Display::returnFontAwesomeIcon('sign-out'),
                     api_get_path(WEB_CODE_PATH) . 'auth/courses.php?action=unsubscribe&unsubscribe=' . $courseCode . '&sec_token=' . $stok . '&category_code=' . $categoryCode,
-                    array('class' => 'btn btn-danger btn-sm', 'title' => get_lang('Unreg')));
+                    array('class' => 'btn btn-danger btn-sm', 'title' => get_lang('Unreg'), 'aria-label' => get_lang('Unreg')));
             }
 
             // start buycourse validation