Update trace bitmap and pixel art dialogs to the new interface

This should be resolve #5 (closed).

But a lot of translations are missing. What's more important? New interface or translated interface?

Fully translated interface:

• es
• eu
• hu

Partially translated interface:

• de
• el
• fr
• gl
• id
• ja
• nl
• pl
• pt
• pt_BR
• ru
• sk
• sl
• vi
• zh_TW

If the translated interface is more important, please add only es, eu, hu. That is all, what we can do. Translators should work on this.