Everything should now be translated in Greek. Will update if I have forgotten anything. Also made some changes to the layer and frame button colors and layer position.
- Added grid size and color in preferences
- Canvas' update_texture() updates the frame button's texture only when the user releases a mouse button. This should optimize drawing in large images.
- Cursor is no longer invisible inside the canvas
- Minor UI changes
- Added some more translations. This is going to be a common thing in commits from now on.