[geary] Fix up po CMakeLists so Geary builds

[Charles Lindsay <clindsay src gnome org>]

commit 6b6db1b7057bda6f655f2c5ed73ea1223103cce8
Author: Charles Lindsay <chaz yorba org>
Date:   Tue Nov 19 17:16:54 2013 -0800

    Fix up po CMakeLists so Geary builds
    
    Piotr Drąg had renamed a po file in commit:c83eed7 but not changed that
    line in the po/CMakeLists.txt file, causing the build to break.  This
    makes Geary build again.

 po/CMakeLists.txt |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/po/CMakeLists.txt b/po/CMakeLists.txt
index 0e8192c..3530945 100644
--- a/po/CMakeLists.txt
+++ b/po/CMakeLists.txt
@@ -5,7 +5,7 @@ set(TRANSLATED
     cs
     da
     de
-    el_GR
+    el
     en_CA
     en_GB
     eo