Hello,
Personnaly I use XWiki both in english and in the targetted language to
"detected" which sentences need to be translated. Then I used the search
page in l10n wiki 
http://l10n.xwiki.org/xwiki/bin/view/L10N/Search with the
value displayed in the EN User Interface to find the exact key to be
translated.
Regards,
2013/1/25 Gerritjan Koekkoek <gerritjankoekkoek(a)gmail.com>
  The XWiki instance where the community can translate
the keys for XWiki
 enterprise is very difficult to use.
 Would it be possible to select the keys based on extensions/modules
 Example:
 1) If I would like to check which keys of the BLOG application are
 translated in dutch? And which are still not translated?
 2) Look at keys for the top-menu bar in XWiki
 To look at a alphabetical list of more then 5000 key's is a bit
 overestimating the stamina of potential translators
 Gerritjan Koekkoek
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