Spelling fixes in comments and descriptions, patch by luzpaz

Differential Revision: https://developer.blender.org/D3744

release/scripts/startup/bl_ui/space_clip.py

@@ -1001,7 +1001,7 @@ class CLIP_PT_stabilization(CLIP_PT_reconstruction_panel, Panel):
             sub.menu('CLIP_MT_stabilize_2d_context_menu', text="",
                      icon='DOWNARROW_HLT')
 
-            # Usually we don't hide things from iterface, but here every pixel of
+            # Usually we don't hide things from interface, but here every pixel of
             # vertical space is precious.
             if stab.use_stabilize_rotation:
                 box.label(text="Tracks For Rotation / Scale")