Use system fonts for backend and web-editor's UI.
This commit removes references to proprietary fonts and allows the OS
to use the system ones. The aim is to reduce http request and the
general footprint (see enterprise counter-part).
The new font-stack:
- apple-system (San Francisco): iOS Safari, macOS Safari, macOS Firefox
- BlinkMacSystemFont (San Francisco): macOS Chrome
- Segoe UI: Windows
- Roboto: Android, Chrome OS
- Helvetica Neue: old OSX versions
- Ubuntu: Ubuntu
- Liberation Sans: Linux (others)
- Arial: Any
- sans-serif: General fallback
This was actually already introduced for the website default theme and
as a general option with [1] but it was not complete: if reaching the
need to use Roboto of the font stack, the repo Roboto was used instead
of the potential system one. It was not shown during testing with the
previous font stack. With the new one, on Ubuntu, it was revealed as
the Ubuntu font comes after Roboto.
[1]: https://github.com/odoo/odoo/commit/c0f2f670eb087991cc9a6a67f4beea5f12bd15f2
task-2995248
closesodoo/odoo#101533
X-original-commit: 9f8f8f2ef88aee746819469c918b2d31ec29d031
Related: odoo/enterprise#31985
Signed-off-by: Adrien Dieudonné (adr) <adr@odoo.com>