UTF-8 Latin ligatures not displaying in PDF Exports

[colinmahns]

Saw this was resolved in #1808 by updating the font OpenSlides used, but did not see a newer ticket mentioning this so I'm opening a new ticket.

Issue:
A number of UTF-8 latin characters, preferred by macOS in text fields and word documents, don't appear to display in OpenSlides PDF exports. Clicking the "Clear Formatting" button in the in-webpage editor does not replace these characters with ASCII, it only removes any formatting on the UTF-8 characters.

Handful of known characters I've identified: ff · fi · fl · ffi · ffl

I've attached two examples.

Expected Behavior:
Unicode characters should still display on PDF exports.

Workaround:
This was resolved on our end by myself running sed against the resolution's csv export to replace the latin characters with the ASCII equivalents and re-uploading to our OpenSlides instance.

Old exports (before I replaced the text, before I tackled formatting issues as well)
CSV: https://gist.githubusercontent.com/colinmahns/75d2ac814d6b1e1cce183ba7c65a49be/raw/6fdab9cb2db39f5a3bd866515a79e1194d3f92e3/openslides-issue.csv
Motion CR-1.pdf
Motion CR-2.pdf

New exports (after I replaced the text and tackled formatting issues -- note: some background changes to OpenSlides also occured)
CSV: https://gist.github.com/colinmahns/53cd09ea28b5c9eef1ac6aa4eab1f809
Motion CR-1-5.pdf
Motion CR-2-7.pdf