More various minor improvements

[a-One-Fan]

• Adds ability to conveniently move images between the ComfyUI node editor and Blender's Image Editor, for easy inpainting or just general editing

Specifically, taking the image from the various preview/save/input nodes, or creating a new load image node / changing the selected one, including saving the currently active image. These are present in the dropdowns for both the Image Editor and ComfyUI Node Editor.

• Some handling for channel packed alpha, to improve above ^
• Minor translation/wording improvements
• Fix incorrect polling in some places

[KarryCharon]

@a-One-Fan Thx for your pull request. We see you are trying to merge into main branch, develop is expected.

[a-One-Fan]

Hey, my bad, I'll merge into the dev branch next time.