Admin: 'Reference number' looks buggy on .pdf format

[mmeest]

Description
Invoice conversion to .pdf format makes 'Reference number' to 'Reference nu.. ' when downloading invoices on admin panel.

Steps to reproduce

1. Log in to https://testadm.internet.ee/admin
2. Navigate to Settings > Invoices
3. Click 'Add' button and fill in required fields
4. Click 'Save' button
5. Click 'Download' button

Expected:
Reference number (or 'Reference no.') would be displayed on invoice

Actual:
'Reference nu..' is displayed