Redmine

Problems:

1. Fonts are not embedded
2. Helvetica is not a standard font on Debian 12 desktop installation
3. As a result, although I can see the pdf file on the screen alright, when printing it on a Brother printer, it is virtually unreadable
4. There was no issue like this before (printing out exported to pdf issues was our workflow for years on the same system)

To replicate the issue, open an existing issue, then click `pdf` link at the bottom of the page to create a pdf export of the issue, say exported.pdf. Then run the following command on the exported file:

```
user@domain$ pdffonts exported.pdf

name type encoding emb sub uni object ID
------------------------------------ ----------------- ---------------- --- --- --- ---------
Helvetica Type 1 WinAnsi no no no 50 0
000002+FreeSans CID TrueType Identity-H yes no yes 51 0
000003+FreeSansBold CID TrueType Identity-H yes no yes 56 0
000004+FreeSansOblique CID TrueType Identity-H yes no yes 61 0
```