--key-language with an empty value (and "language": null in the config)
asks for the system locale, not for a specific language. When that locale
has no translation, fastfetch aborted with exit 477 instead of printing
anything, so the same config broke on every locale outside the twelve
supported ones, and under LC_ALL=C variants such as POSIX.
Auto-detected locales now fall back to English. An explicitly requested
language still errors out, so typos and zh are still reported.
Carter Li