Add auto-subject to all occurrences of support@hifis.net

Created by: cmeessen

To help automate the handling of mails in the HIFIS Helpdesk, we should add automated subjects:

<a href="[mailto:support@hifis.net?subject=[RSD]">Help](mailto:support@hifis.net?subject=[RSD]%22%3EHelp) with RSD</a>