UX: (Minor) Behavior - Import window

[kaltinril]

• 1. Popup window is missing a header/title
• 2. The window is a bit confusing, and, the text for the prompt is small and hard to read at 1440p.
• 3. The text says "The list above shows all files in the project folder" which is a lie, it shows nothing.
• 4. Suggestion: Grey out OK until file is selected (Can skip if you want)
• 5. What is the point of the single line Textbox at the top?
• 6. If the popup for selecting a file outside the project is going to remain, change No to cancel. No doesn't explain what will happen, cancel implies better.
• 7. DOC: Add information about this import feature