Fix: Correct several messages in the UI

- Show/hide mask layers: the tooltip was confusing from a user's
  perspective, because they should not be expected to know what a hide
  flag is.
- Active Spline -> Active Point: likely a copy and paste error.
- Geo Nodes face is planar node: forgotten article.
- Axes, plural instead of axis for the viewport preferences. Here
  there are several usages of axis or axes. Since they refer to
  coordinate axes I believe they should be plural, even though the
  property `mini_axis_type` is still wrong.

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![image](/attachments/7ccdc72d-1e83-4c22-b8e9-c3b7c5fcf629)
![image](/attachments/746015bc-23e1-49bc-8828-df07d7605048)
![image](/attachments/61c58766-a8f5-4a90-b862-c9b57c44c355)

Pull Request: blender/blender#105814

source/blender/editors/mask/mask_ops.c

@@ -1732,7 +1732,7 @@ void MASK_OT_hide_view_clear(wmOperatorType *ot)
 
   /* identifiers */
   ot->name = "Clear Restrict View";
-  ot->description = "Reveal the layer by setting the hide flag";
+  ot->description = "Reveal temporarily hidden mask layers";
   ot->idname = "MASK_OT_hide_view_clear";
 
   /* api callbacks */
@@ -1792,7 +1792,7 @@ void MASK_OT_hide_view_set(wmOperatorType *ot)
 {
   /* identifiers */
   ot->name = "Set Restrict View";
-  ot->description = "Hide the layer by setting the hide flag";
+  ot->description = "Temporarily hide mask layers";
   ot->idname = "MASK_OT_hide_view_set";
 
   /* api callbacks */

source/blender/makesrna/intern/rna_mask.c

@@ -826,7 +826,7 @@ static void rna_def_mask_splines(BlenderRNA *brna)
                                  NULL,
                                  NULL);
   RNA_def_property_flag(prop, PROP_EDITABLE | PROP_NEVER_UNLINK);
-  RNA_def_property_ui_text(prop, "Active Spline", "Active spline of masking layer");
+  RNA_def_property_ui_text(prop, "Active Point", "Active point of masking layer");
 }
 
 static void rna_def_maskSplinePoints(BlenderRNA *brna)

source/blender/makesrna/intern/rna_userdef.c

@@ -4779,7 +4779,7 @@ static void rna_def_userdef_view(BlenderRNA *brna)
   /* mini axis */
   static const EnumPropertyItem mini_axis_type_items[] = {
       {USER_MINI_AXIS_TYPE_NONE, "NONE", 0, "Off", ""},
-      {USER_MINI_AXIS_TYPE_MINIMAL, "MINIMAL", 0, "Simple Axis", ""},
+      {USER_MINI_AXIS_TYPE_MINIMAL, "MINIMAL", 0, "Simple Axes", ""},
       {USER_MINI_AXIS_TYPE_GIZMO, "GIZMO", 0, "Interactive Navigation", ""},
       {0, NULL, 0, NULL, NULL},
   };
@@ -4789,7 +4789,7 @@ static void rna_def_userdef_view(BlenderRNA *brna)
   RNA_def_property_ui_text(
       prop,
       "Mini Axes Type",
-      "Show a small rotating 3D axes in the top right corner of the 3D viewport");
+      "Show small rotating 3D axes in the top right corner of the 3D viewport");
   RNA_def_property_update(prop, 0, "rna_userdef_gizmo_update");
 
   prop = RNA_def_property(srna, "mini_axis_size", PROP_INT, PROP_PIXEL);

source/blender/nodes/NOD_static_types.h

@@ -337,7 +337,7 @@ DefNode(GeometryNode, GEO_NODE_INPUT_MESH_EDGE_ANGLE, 0, "MESH_EDGE_ANGLE", Inpu
 DefNode(GeometryNode, GEO_NODE_INPUT_MESH_EDGE_NEIGHBORS, 0, "MESH_EDGE_NEIGHBORS",InputMeshEdgeNeighbors, "Edge Neighbors", "Retrieve the number of faces that use each edge as one of their sides")
 DefNode(GeometryNode, GEO_NODE_INPUT_MESH_EDGE_VERTICES, 0, "MESH_EDGE_VERTICES", InputMeshEdgeVertices, "Edge Vertices", "Retrieve topology information relating to each edge of a mesh")
 DefNode(GeometryNode, GEO_NODE_INPUT_MESH_FACE_AREA, 0, "MESH_FACE_AREA", InputMeshFaceArea, "Face Area", "Calculate the surface area of a mesh's faces")
-DefNode(GeometryNode, GEO_NODE_INPUT_MESH_FACE_IS_PLANAR, 0, "MESH_FACE_IS_PLANAR",InputMeshFaceIsPlanar, "Is Face Planar", "Retrieve whether all triangles in a face are on the same plane, i.e. whether have the same normal")
+DefNode(GeometryNode, GEO_NODE_INPUT_MESH_FACE_IS_PLANAR, 0, "MESH_FACE_IS_PLANAR", InputMeshFaceIsPlanar, "Is Face Planar", "Retrieve whether all triangles in a face are on the same plane, i.e. whether they have the same normal")
 DefNode(GeometryNode, GEO_NODE_INPUT_MESH_FACE_NEIGHBORS, 0, "MESH_FACE_NEIGHBORS",InputMeshFaceNeighbors, "Face Neighbors", "Retrieve topology information relating to each face of a mesh")
 DefNode(GeometryNode, GEO_NODE_INPUT_MESH_ISLAND, 0, "MESH_ISLAND", InputMeshIsland, "Mesh Island", "Retrieve information about separate connected regions in a mesh")
 DefNode(GeometryNode, GEO_NODE_INPUT_MESH_VERTEX_NEIGHBORS, 0, "MESH_VERTEX_NEIGHBORS", InputMeshVertexNeighbors, "Vertex Neighbors", "Retrieve topology information relating to each vertex of a mesh")