Changing locale causes the UI to immediately bug with no solution except Alt+F4

[Proman4713]

Is there an existing issue for this?

• I have searched the existing issues and found none matching what I'm reporting.

Bug Description

In the installer, after selecting Arabic, the UI became like this:

This is an identical reproduction of the issue, since I Alt+F4-ed out of the installer to mount my Windows drive and change some settings, but that did not affect the graphical bug. In addition to the Next button still saying 'Next'.
I thought it could be fixed by re-selecting Arabic, so I clicked the item above Arabic with the intention to switch back. Just to be greeted with this:

I Alt+F4-ed out of the installer again to copy the screenshots to my SSD and shut down.

Steps to reproduce the behavior

1. Scroll down and click 'العربية'
2. Then click 'ئوُيغوُرچه' (Uyghur)

Expected behavior

The language should properly shift to Arabic, and the UI shouldn't break.

Ubuntu release

Other (specify in the last field)

What architecture are you using?

amd64

System info

Ubuntu 26.04 LTS official ISO, no upgraded packages

Additional context

No response