Update vkviewer.po

hab auch hier noch 1,2 Sachen gefunden
Update vkviewer.po

changed all "geo-referencing" to "georeferencing" - in the text. 
"faq-geo-referencing-*" and "faq-geo-referencing-history-*" stays the same
Merge pull request #44 from JSchwzr/patch-2

Merge pull request for updating the english faq vkviewer.po