331: Add warning before saving "both hands" for 1 handed signs

[Harukaichii]

• Added warning dialog when we encounter scenario described in title
• deleted includephrase reference -- doesn't seem like it is being used?

https://github.com/user-attachments/assets/89081e14-12a1-4f3e-abf3-ff0c1ad314ab

https://github.com/user-attachments/assets/ece2d6f7-d871-4771-9c82-17059d15d96c

Note: If you toggle between the options it will reset

https://github.com/user-attachments/assets/1714b2f0-f5f1-481e-bb19-6d56eaa83c65

[Harukaichii]

Side note: going through the code is a bit of a pain due to the clustering of UI logic with business logic.

If I'm still here after Beta release, can I try out some ways to separate the two?