Minor: Fix language variables

public/main/admin/usergroups.php

@@ -64,7 +64,7 @@ $action_links = 'function action_formatter (cellvalue, options, rowObject) {
     return \''
     .' <a href="add_users_to_usergroup.php?id=\'+options.rowId+\'">'.Display::getMdiIcon(ObjectIcon::USER, 'ch-tool-icon', null, ICON_SIZE_MEDIUM, get_lang('Subscribe users to class')).'</a>'
     .' <a href="add_courses_to_usergroup.php?id=\'+options.rowId+\'">'.Display::getMdiIcon(ObjectIcon::COURSE, 'ch-tool-icon', null, ICON_SIZE_MEDIUM, get_lang('Subscribe class to courses')).'</a>'
-    .' <a href="add_sessions_to_usergroup.php?id=\'+options.rowId+\'">'.Display::getMdiIcon(ObjectIcon::SESSION, 'ch-tool-icon', null, ICON_SIZE_MEDIUM, get_lang('SubscribeClassToCourse sessions')).'</a>'
+    .' <a href="add_sessions_to_usergroup.php?id=\'+options.rowId+\'">'.Display::getMdiIcon(ObjectIcon::SESSION, 'ch-tool-icon', null, ICON_SIZE_MEDIUM, get_lang('Subscribe class to sessions')).'</a>'
     .' <a href="?action=edit&id=\'+options.rowId+\'">'.Display::getMdiIcon(ActionIcon::EDIT, 'ch-tool-icon', null, ICON_SIZE_SMALL, get_lang('Edit')).'</a>'
     .' <a onclick="javascript:if(!confirm('."\'".addslashes(api_htmlentities(get_lang("Please confirm your choice"), ENT_QUOTES))."\'".')) return false;"  href="?action=delete&id=\'+options.rowId+\'">'.Display::getMdiIcon(ActionIcon::DELETE, 'ch-tool-icon', null, ICON_SIZE_SMALL, get_lang('Delete')).'</a>\';
 }';

public/main/lp/lp_subscribe_users_to_category.php

@@ -342,7 +342,7 @@ if ($form->validate()) {
     $items = [$formUsers->toHtml(), $form->toHtml()];
 
     if ($allowUserGroups) {
-        $headers[] = get_lang('SubscribeClassesToLpCategory');
+        $headers[] = get_lang('Subscribe classes to category');
         $items[] = $formUserGroup->toHtml();
     }
     $tabs = Display::tabs($headers, $items);