PSA: Space as the first thing in PLURAL output does not work
The message has been altered to be more robust and avoid space issues.
The Italian and Neapolitan translations for MediaWiki:Notification-header-foreign-message and MediaWiki:Notification-header-foreign-alert were trying to do something like "from $3{{PLURAL:$4| and one other wiki| and $4 other wikis|0=}}"
, presumably trying to avoid the extra space at the end in the case where $4
is zero. This is unnecessary, and it actually breaks: when testing in Italian I saw "Altri messaggi da Wikipedia in araboe un altro wiki", which should have been "Altri messaggi da Wikipedia in arabo e un altro wiki". The space at the beginning of the PLURAL cases appears to get swallowed. I was surprised by that too.
So don't use this trick (in notification messages or anywhere else), because it doesn't work :) . Pinging User:Beta16 and User:C.R. who wrote these translations.