SF # 572928 One word change for lib/libgettext.tex

Fix typo.
diff --git a/Doc/lib/libgettext.tex b/Doc/lib/libgettext.tex
index c19d9b9..4c81107 100644
--- a/Doc/lib/libgettext.tex
+++ b/Doc/lib/libgettext.tex
@@ -448,7 +448,7 @@
 
 \subsubsection{Deferred translations}
 
-In most coding situations, strings are translated were they are coded.
+In most coding situations, strings are translated where they are coded.
 Occasionally however, you need to mark strings for translation, but
 defer actual translation until later.  A classic example is: