Fixes the `'\1' is not recognized as an internal or external command`
error when trying to run the target `update-pot` with MSBuild.
The `|` characters probably messed with cmd.exe or PowerShell syntax
rules so they were replaced with slashes `/`.
Also, at least some implementations of sed for Windows would produce
CRLF line endings instead of LF line endings. The issue is fixed by
adding the flag `-b`.
963cd1b347