Security vulnerabilities and automated fixes for shell script issues
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A command injection vulnerability in `update-po.sh` allowed maliciously crafted filenames in `po/POTFILES.in` to be interpreted as shell commands via unquoted command substitution. The fix replaces `$(cat po/POTFILES.in)` with `xgettext`'s native `--files-from=` flag, eliminating the shell word-splitting attack surface entirely. This is a textbook example of how a single unquoted substitution can become a dangerous exploit primitive.