Some nepomuk ui files have strings like <string extracomment="@info">some message</string>
xgettext extracts this properly to msgctxt "@info" msgid "some message"
ui compiler generates tr2i18n("some message", 0) -> that does not match xgettext, therefore no translated msg is found

With <string comment="@info">some message</string>
the ui compiler generates tr2i18n("some message", "@info"), that does match xgettext and the translated msg is found and shown

Tested using locale x-test (http://techbase.kde.org/Development/Tutorials/Localization/Building_KDE's_l10n_Module), 
messages are translated