Themes

Maybe you could use renderers to custom the logininfo div.

1. At the root of your theme, write the file renderers.php containing :

   <?php
   require_once('renderers/core_renderer.

   php');

2. Use rendererfactory in config.php :
   

   $THEME->rendererfactory = 'theme_overridden_renderer_factory';

3. mkdir a folder called renderers
4. touch renderers/core_renderer.php
   
5. customize the function that create the login, for me that's the code (using FontAwesome icone) :
   

   <?php
   class theme_YOURTHEME_core_renderer extends theme_bootstrapbase_core_renderer {
   
    public function login_info($withlinks = null) {
           global $USER, $CFG, $DB, $SESSION;
           if (during_initial_install()) {
               return '';
           }
           if (is_null($withlinks)) {
               $withlinks = empty($this->page->layout_options['nologinlinks']);
           }
           $loginpage = ((string)$this->page->url === get_login_url());
           $course = $this->page->course;
           if (\core\session\manager::is_loggedinas()) {
               $realuser = \core\session\manager::get_realuser();
               $fullname = fullname($realuser, true);
               if ($withlinks) {
                   $loginastitle = get_string('loginas');
                   $realuserinfo = " [<a href=\"$CFG->wwwroot/course/loginas.php?id=$course->id&amp;sesskey=".sesskey()."\"";
                   $realuserinfo .= "title =\"".$loginastitle."\">$fullname</a>] ";
               } else {
                   $realuserinfo = " [$fullname] ";
               }
           } else {
               $realuserinfo = '';
           }
           $loginurl = get_login_url();
           if (empty($course->id)) {
               // $course->id is not defined during installation
               return '';
           } else if (isloggedin()) {
               $context = context_course::instance($course->id);
               $fullname = fullname($USER, true);
               // Since Moodle 2.0 this link always goes to the public profile page (not the course profile page)
               if ($withlinks) {
                   $linktitle = get_string('viewprofile');
                   $username = "<a href=\"$CFG->wwwroot/user/profile.php?id=$USER->id\" title=\"$linktitle\">$fullname</a>";
               } else {
                   $username = $fullname;
               }
               if (is_mnet_remote_user($USER) and $idprovider = $DB->get_record('mnet_host', array('id'=>$USER->mnethostid))) {
                   if ($withlinks) {
                       $username .= " from <a href=\"{$idprovider->wwwroot}\">{$idprovider->name}</a>";
                   } else {
                       $username .= " from {$idprovider->name}";
                   }
               }
               if (isguestuser()) {
                   $loggedinas = $realuserinfo.get_string('loggedinasguest');
                   if (!$loginpage && $withlinks) {
                       $loggedinas .= " <a href=\"$loginurl\">". '<i class="fa fa-sign-in fa-2x"></i>' .'</a>';
                   }
               } else if (is_role_switched($course->id)) { // Has switched roles
                   $rolename = '';
    if ($role = $DB->get_record('role', array('id'=>$USER->access['rsw'][$context->path]))) {
                       $rolename = ': '.role_get_name($role, $context);
                   }
                   $loggedinas = get_string('loggedinas', 'moodle', $username).$rolename;
                   if ($withlinks) {
                       $url = new moodle_url('/course/switchrole.php', array('id'=>$course->id,'sesskey'=>sesskey(), 'switchrole'=>0, 'returnurl'=>$this->page-$
                       $loggedinas .= ' ('.html_writer::tag('a', get_string('switchrolereturn'), array('href' => $url)).')';
                   }
               } else {
                   $loggedinas = $realuserinfo.$username;
                   if ($withlinks) {
                       $loggedinas .= " <a href=\"$CFG->wwwroot/login/logout.php?sesskey=".sesskey()."\">".'<i class="fa fa-sign-out fa-2x"></i>'.'</a>';
                   }
               }
           } else {
               $loggedinas = get_string('loggedinnot', 'moodle');
               if (!$loginpage && $withlinks) {
                   $loggedinas .= " <a href=\"$loginurl\">". '<i class="fa fa-sign-in fa-2x"></i>'  .'</a>';
               }
           }
           $loggedinas = '<div class="logininfo">'.$loggedinas.'</div>';
           if (isset($SESSION->justloggedin)) {
               unset($SESSION->justloggedin);
               if (!empty($CFG->displayloginfailures)) {
                   if (!isguestuser()) {
                       // Include this file only when required.
                       require_once($CFG->dirroot . '/user/lib.php');
                       if ($count = user_count_login_failures($USER)) {
                           $loggedinas .= '<div class="loginfailures">';
                           $a = new stdClass();
                           $a->attempts = $count;
                           $loggedinas .= get_string('failedloginattempts', '', $a);
                           if (file_exists("$CFG->dirroot/report/log/index.php") and has_capability('report/log:view', context_system::instance())) {
                               $loggedinas .= ' ('.html_writer::link(new moodle_url('/report/log/index.php', array('chooselog' => 1,
                                       'id' => 0 , 'modid' => 'site_errors')), get_string('logs')).')';
                           }
                           $loggedinas .= '</div>';
                       }
                   }
               }
           }
           return $loggedinas;
       }
   
   }