UI: Improve Add Dialog

[linuxcaffe]

Describe your improvement idea or feature request

Improve and extend Add Task Dialog

How would you like to see it implemented?

(see screenshot)

Put here any screenshots or videos (optional)

How can we contact you (optional)

No response

Would you like to work on this issue?

None

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[linuxcaffe]

[D-extremity]

do we really need this change? please confirm it, so that i will start working on it

[Pavel401]

@D-extremity , I have assigned it to you.

PS.
Keep less margin outside and more space inside the dialog.

[Pavel401]

#410 Link this as well

[Pavel401]

@D-extremity keep the changes of this PR #399

[linuxcaffe]

@D-extremity maybe even consider #414 ?

[D-extremity]

Okay okay i will do consider those PR and issues