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Update of Icelandic translation

Submitted by: Gr?tar J?n Einarsson (gretar AT vedur DOT is)

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@4193 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9