Version:           unspecified (using KDE 4.6.3) 
OS:                Linux

1. open the file http://websvn.kde.org/trunk/l10n-kde4/ru/messages/kdepim/libmessagecomposer.po?revision=1233383&view=markup in Lokalize
2. edit a random string (for example, the first one) and save the file.
After that you get the "Syntax check" warning:
> Syntax check has found possible erorrs.
> Translation Units view lists suspicious entries.
> Reasons: specify %1 in first plural form explicitly for cases like 21, 31, ...

But if you edit the false-buggy messages so that the "%1" is not serapated by a line break, then the "Syntax check" warning goes away.

One of the messages from that file that causes the bug:
> msgstr[0] ""
> "<p>Вспомогательный сертификат удостоверяющего центра</p><p align=\"center"
> "\"><b>%4</b></p><p>вашего сертификата S/MIME, используемого для подписи</"
> "p><p align=\"center\"><b>%2</b> (номер %3),</p><p>истекает менее чем через %"
> "1 день.</p>"

Reproducible: Always