af21c50aec
the output of `bash --version` is different when the system is configured for e.g. de_DE locale. For german locale the it's `GNU bash, Version 5.0…` with an uppercase 'V'. This makes the bash completion setup fail with the error `Error: The minimal supported Bash version is 4.4`. To fix this, the version match regex now uses the `IGNORECASE` flag.