[gegl] Fix string typos

[Øyvind Kolås <ok src gnome org>]

commit 5c9553b0c78dfb7feb8f2fae687cfd93d2c7b7f8
Author: Anders Jonsson <anders jonsson norsjovallen se>
Date:   Thu Dec 1 23:08:20 2016 +0100

    Fix string typos
    
    https://bugzilla.gnome.org/show_bug.cgi?id=775494

 gegl/buffer/gegl-buffer.c               |    2 +-
 operations/common/panorama-projection.c |    2 +-
 operations/common/snn-mean.c            |    4 ++--
 operations/common/threshold.c           |    2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/gegl/buffer/gegl-buffer.c b/gegl/buffer/gegl-buffer.c
index a416500..891c7b0 100644
--- a/gegl/buffer/gegl-buffer.c
+++ b/gegl/buffer/gegl-buffer.c
@@ -241,7 +241,7 @@ gegl_buffer_set_property (GObject      *gobject,
         break;
 
       case PROP_FORMAT:
-        /* Do not set to NULL even if asked to do so by a non-overriden
+        /* Do not set to NULL even if asked to do so by a non-overridden
          * value, this is needed since a default value can not be specified
          * for a gpointer paramspec
          */
diff --git a/operations/common/panorama-projection.c b/operations/common/panorama-projection.c
index 38999f1..f69a23f 100644
--- a/operations/common/panorama-projection.c
+++ b/operations/common/panorama-projection.c
@@ -540,7 +540,7 @@ gegl_op_class_init (GeglOpClass *klass)
     "reference-composition", composition,
     "position-dependent",    "true",
     "categories" ,           "map",
-    "description", _("Perform a equlinear/gnomonic or little planet/stereographic projection of a 
equirectangular input image."),
+    "description", _("Perform an equilinear/gnomonic or little planet/stereographic projection of an 
equirectangular input image."),
     NULL);
 }
 #endif
diff --git a/operations/common/snn-mean.c b/operations/common/snn-mean.c
index ae9fd27..e22c957 100644
--- a/operations/common/snn-mean.c
+++ b/operations/common/snn-mean.c
@@ -146,7 +146,7 @@ snn_mean (GeglBuffer          *src,
           gfloat  accumulated[4]={0.0f, 0.0f, 0.0f, 0.0f};
           gint    count=0;
 
-          /* iterate through the upper left quater of pixels */
+          /* iterate through the upper left quarter of pixels */
           for (v=-radius;v<=0;v++)
             for (u=-radius;u<= (pairs==1?radius:0);u++)
               {
@@ -335,7 +335,7 @@ gegl_op_class_init (GeglOpClass *klass)
     "title",       _("Symmetric Nearest Neighbour"),
     "description",
         _("Noise reducing edge preserving blur filter based "
-          " on Symmetric Nearest Neighbours"),
+          "on Symmetric Nearest Neighbours"),
         NULL);
 }
 
diff --git a/operations/common/threshold.c b/operations/common/threshold.c
index bce324c..030d814 100644
--- a/operations/common/threshold.c
+++ b/operations/common/threshold.c
@@ -25,7 +25,7 @@
 property_double (value, _("Threshold"), 0.5)
     value_range (-200, 200)
     ui_range    (-1, 2)
-    description(_("Scalar threshold level (overriden if an auxiliary input buffer is provided.)."))
+    description(_("Scalar threshold level (overridden if an auxiliary input buffer is provided.)."))
 
 #else