[gegl] edge-sobel: mark description added in prev commit for translation

[Øyvind Kolås <ok src gnome org>]

commit 60b5dd6b17b288a0e4894ef072a758f1abe731ea
Author: Øyvind Kolås <pippin gimp org>
Date:   Tue Oct 7 15:37:40 2014 +0200

    edge-sobel: mark description added in prev commit for translation

 operations/common/edge-sobel.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/operations/common/edge-sobel.c b/operations/common/edge-sobel.c
index 9b91147..50d4b6d 100644
--- a/operations/common/edge-sobel.c
+++ b/operations/common/edge-sobel.c
@@ -29,7 +29,7 @@ property_boolean (horizontal,  _("Horizontal"), TRUE)
 property_boolean (vertical,  _("Vertical"), TRUE)
 
 property_boolean (keep_signal,  _("Keep Signal"), TRUE)
-     description ("Keep negative values in result, when off the absolute value of the result is used 
instead.")
+     description (_("Keep negative values in result, when off the absolute value of the result is used 
instead."))
 
 #else