Ubuntu – Arabic font ubuntu 17.10

The Language Support section in Ubuntu lets you change the interface language, in other words, the menus, panels and other elements. It has nothing to do with the way a web page is displayed.

I am no expert in Arabic, but usually, if a web page is not displayed correctly, what you need to change is its character encoding,
View -> Character Encoding in Firefox.

The source code of the page has the following:

charset=UTF-8

font-family: georgia, helvetica, times new roman, serif;

Looks like it's a work in progress. GNOME only supports integer scaling properly (source).

Quote:

Currently, we only allow to scale windows by integral factors (typically 2). This proves somewhat limiting as there are many systems that are just in between the dpi ranges that are good for scale factor 2, or unscaled.