The string has an extra trailing whitespace, that should be not relevant
in .properties file
https://hg.mozilla.org/releases/mozilla-aurora/file/default/dom/locales/en-US/chrome/security/csp.properties#l48
If Pootle is reporting an error because your translation doesn't end
with a trailing whitespace, simply ignore the warning.
Francesco
> Hi,
> Just seen on pootle following message
> 'Ignoring source “%1$S” (Only supported within script-src).␠' - with
> extra whitespace
> at the end. Location is
>
> Firefox 52 ESR (Aurora)
> dom/chrome/security/csp.properties.po
> Unit #22444342
>
> Could you please check?
>