[gimp] Mark user-visible-message for translation

[Alexandre Prokoudine <aprokoudine src gnome org>]

commit 382f20450ce96f615252c3d2d4870d40340a696e
Author: Alexandre Prokoudine <alexandre prokoudine gmail com>
Date:   Sat May 14 17:58:21 2016 +0300

    Mark user-visible-message for translation

 app/dialogs/preferences-dialog.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/app/dialogs/preferences-dialog.c b/app/dialogs/preferences-dialog.c
index 43ac9d4..ba8a546 100644
--- a/app/dialogs/preferences-dialog.c
+++ b/app/dialogs/preferences-dialog.c
@@ -1454,7 +1454,7 @@ prefs_dialog_new (Gimp       *gimp,
                                  "gray-profile",
                                  store,
                                  _("Select Preferred Grayscale Color Profile"),
-                                 ("_Grayscale profile:"),
+                                 _("_Grayscale profile:"),
                                  GTK_TABLE (table), row++, size_group);
 
     prefs_profile_combo_box_add (color_config,