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I believe that the issue is that RevDelete log entries are constructed as "<action> <target>", where <action> is either [[MediaWiki:revdelete-hid]] or [[MediaWiki:revdelete-unhid]], and <target> is selected from [[MediaWiki:revdelete-content]], [[MediaWiki:revdelete-uname]] or [[MediaWiki:revdelete-summary]].

Why is it therefore impossible to translate? It seems from your post (although I don't speak a word of Polish) that the phrase for "hid username" needs to be "ukryj nazwę użytkownika", while "unhid username" would be "nie ukrywaj nazwy użytkownika"; the last letter of the second word is different - is this the distinction? Is it grammatical - a different case or conjugation? 

(In reply to comment #1)
> Why is it therefore impossible to translate? It seems from your post (although
> I don't speak a word of Polish) that the phrase for "hid username" needs to be
> "ukryj nazwę użytkownika", while "unhid username" would be "nie ukrywaj nazwy
> użytkownika"; the last letter of the second word is different - is this the
> distinction? Is it grammatical - a different case or conjugation? 

Doesn't really matter. Inflection for nouns and verbs is so common that this is a bug and should be fixed.

In slavic language we have infection. It means in messages constructed with "<action> <target>" we must inflect target. Following table maybe help you.

* current value
action:
* MediaWiki:revdelete-hid/pl     = "ukryj $1"
  target must be in dative singular
* MediaWiki:revdelete-unhid/pl   = "nie ukrywaj $1"
  target must be in genitive singular

target:
* MediaWiki:revdelete-uname/pl   = "nazwę użytkownika"
* MediaWiki:revdelete-summary/pl = "opis zmian"
* MediaWiki:revdelete-content/pl = "zawartość"

* msg + msg = now is -> must be
ok:
* MediaWiki:revdelete-hid/pl+MediaWiki:revdelete-uname/pl     = 
   "ukryj nazwę użytkownika"       -> "ukryj nazwę użytkownika"
* MediaWiki:revdelete-hid/pl+MediaWiki:revdelete-summary/pl   = 
   "ukryj opis zmian"              -> "ukryj opis zmian"
* MediaWiki:revdelete-hid/pl+MediaWiki:revdelete-content/pl   = 
   "ukryj zawartość"               -> "ukryj zawartość"
infection error:
* MediaWiki:revdelete-unhid/pl+MediaWiki:revdelete-uname/pl   = 
   "nie ukrywaj nazwę użytkownika" -> "nie ukrywaj nazwy użytkownika"
* MediaWiki:revdelete-unhid/pl+MediaWiki:revdelete-summary/pl = 
   "nie ukrywaj opis zmian"        -> "nie ukrywaj opisu zmian"
* MediaWiki:revdelete-unhid/pl+MediaWiki:revdelete-content/pl = 
   "nie ukrywaj zawartość"         -> "nie ukrywaj zawartości"

This turned out to be a bit harder than I excpected, because the $1 can actually be a list of items:

$s .= wfMsgForContent( 'revdelete-hid', implode( ', ', $changes[0] ) ); (should use $wgLang->commaList() btw)

Would it be enough to keep the revdelete-(un)hid and make variants of revdelete-{uname,summary,content} for the unhid message?

Updated synopsis

Paweł, with the new log messages implementation that Niklas did for bug 24156, there is a need to rewrite these messages anyway. Please be prepared to discuss some feedback requests Niklas may make in this issue.

Fixed in r97044.