kcms/regionandlang: Fix package installation error message
The error message wants to show a package list and the error details, but it was missing the actual packages
Test plan
Add some language to the list and wait for some error to happen.
I could easily generate an authentication error by launching kcmshell6 kcm_regionandlag
Screenshots
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6.5 since it changes a translation string and it's not a big deal