fix strtr for php 5.4

git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@21451 35612d4c-9d10-0410-837c-bf9dd1be60d7
fix notification template for numeric tag - see #4415

git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@21454 35612d4c-9d10-0410-837c-bf9dd1be60d7