to having write access to certain directories (system's temporary directory, MKVToolNix's file identification cache directory and others) & display proper error messages if not.

* MKVToolNix GUI: the GUI will check for several potential installation issues wrt. * MKVToolNix GUI: under certain circumstances the GUI would try to display error messages from a secondary thread, which isn't allowed in Qt, causing to program to either hang or outright crash. Now they're assigned sequentially in the order the tracks appear in the destination file again. * mkvmerge: track numbers in the destination file were assigned out-of-order when the track order in the source files differs from the one in the destination file. * mkvmerge: sorting tracks by type did not work properly when some tracks weren't copied. This fixes the programs not catching an exception from the `boost::filesystem` library which doesn't cope with mis-configured locale systems well.

If neither of the three succeeds, an error message will be shown, and the program will abort. if environment variables such as `LC_ALL` have been set to `fr_FR.UTF-8` but the locale for `fr_FR.UTF-8` hasn't been built, MKVToolNix will try to fall back to `en_US.UTF-8` first & `C.UTF-8` second. * all: Linux: if initializing the locale system based on the system's settings fails, e.g. Also added an installation check for the same issue. This fixes some installation issues that could occur when a user extracted a portable app archive into a folder like `C:Program FilesMKVToolNix`. * Windows installer: the installer will now remove the file `dataportable-app` if it's present in the installation directory as its presence would signal to the app to run in portable mode, requiring write access to its base directory. The oldest Debian coming with this version is Debian 10 'Buster' for Ubuntu it's 18.10 'Cosmic Cuttlefish'.

This means that the minimum glibc version this AppImage is compatible with has also been bumped, to v2.28. * AppImage: the AppImage is now built on AlmaLinux 8 with Qt 6.5.1. * MKVToolNix GUI: header editor: for files that only contain legacy track language elements but no IETF language elements the header editor will now derive the IETF language elements from the legacy elements.

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