Fixes #377. The issue was that the shader material was being shared with the background of the cel buttons, and when the cel button transparent background was resized, the canvas transparent background was also affected.
* Sync for my local files to my repository
* This is frame properties update, it works but I can't be stored while
saving or loading and that makes crashes just the beggining :)
* I forgot this files :P
* Frame Properties update.
* Updating frame properties
* Update Translations.pot
* Changes to CanvasPreview and CelButton change
