Correct the comment description of the "Replace" partition behavior

Improve string formatting and context

FIXES #2018

Copy-paste-o, was using wrong string value for minimum size,
found by failing unit test.

While this isn't useful in production, it makes tests a lot
simpler to write since you don't have to wrestle with
creating new GS objects in order to start fresh.

While here, remove the textual entry in GS, which was unused.

CI: Switch Fedora Qt 6 builds to Fedora Linux 40

Fedora Linux 40 has the necessary components as part of upgrading
to KDE Plasma 6.

From inside Calamares, register libcalamares to the
interpreter by hand; from external Python processes
the regular extension library hooks are called.

Tested by running ./build/localmodule dummypython
(which means that the shared library is not present
in the current directory, so then `import libcalamares`
fails if the module is not already registered --
a test scenario that previous attempt at module
import missed).

bqi is one possible name of Luri / Lhur language,
as far as I can tell -- there is also Northern Luri,
which is supported by Qt and has code lrc.

ie is Interlingue, which Qt maps to C locale.
Work around that by mapping it to interlingua.

The language list hasn't updated in a long time, and the API
changed underneath. Update the getter -- while at it, this
changes the "completion" criterium to count only the strings
in Calamares itself, not the fdo + python bits too.

These come through without function information, but we
can format them in one line by mis-using function info.

Make the log-to-file always follow columns (with time
at the start of each line) so that stdout and the
log file look more alike.

When setting up the application, output goes to stdout,
so do it again once the logfile is configured, so that
these specific settings are in the log file as well.