[Problem] AppImage updater should support unicode/emojis

[luzpaz]

Describe the bug
When updating AppImages through the FreeCAD preferences, the dialog that comes up confirming their is an available update doesn't display emojis (that are shown the weekly build notes (source: weekly build notes)

To Reproduce
Steps to reproduce the behavior:

1. Edit -> Preferences
2. AppImage
3. Click Check for updates button

Result:
if you're on a slightly older weekly appimage then the dialog will display showing lack of support for emojis

Screenshots

Weekly build notes: https://github.com/FreeCAD/FreeCAD-Bundle/releases/tag/weekly-builds

Additional context
Not sure is if this is FreeCAD software related or AppImage software related.

[adrianinsaval]

Instead I would remove emojis from the release page, this code is currently hosted at https://github.com/looooo/freecad.appimage_updater which probably should be moved to an org repo too