[gegl] Bug 750473 - Replace `quote' by 'quote'

[Michael Natterer <mitch src gnome org>]

commit 2b54dea5f050be2be53987bd4d571f57fed4004d
Author: Michael Natterer <mitch gimp org>
Date:   Sun Jun 7 00:49:51 2015 +0200

    Bug 750473 - Replace `quote' by 'quote'
    
    Done that in gegl:value-invert

 operations/common/value-invert.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/operations/common/value-invert.c b/operations/common/value-invert.c
index 9c44021..10869d8 100644
--- a/operations/common/value-invert.c
+++ b/operations/common/value-invert.c
@@ -148,7 +148,7 @@ gegl_op_class_init (GeglOpClass *klass)
     "categories" , "color",
     "description",
         _("Inverts just the value component, the result is the corresponding "
-          "`inverted' image."),
+          "'inverted' image."),
     "cl-source"  , value_invert_cl_source,
     NULL);
 }