Spanish date formats are broken

Some text formats are broken on Windows:

The reason for this is that the configuration entity that contains the pattern for these formats (example for the LONG format):

Array
(
[uuid] => 19278ae1-7bcb-4a64-9804-5891877d4f91
[langcode] => es
[status] => 1
[dependencies] => Array
(
)

[id] => long
[label] => Fecha larga por defecto
[locked] =>
[pattern] => l, F j, Y - H:i
en contexto: formato de fecha PHP
)

contains a line break plus some additional text. In this example the pattern passed to PHP's format date is:

$pattern = << l, F j, Y - H:i
en contexto: formato de fecha PHP
EOT;

So you end up with what can be seen in the screenshot.