"Ubuntu is [...] accessible to all".
I think this is one of the awesome things in this OS and community. A few years ago, I received a bug in Gufw:
By example, I have 2 comboboxes:
|"Deny" for "Incoming"|
You can see if the "Deny" value is for "Incoming" or for "Outgoing".
But a visual impairment user will focus on "Deny" and ORCA will speech these options: "Allow, Deny, Reject":
|"Allow, Deny, Reject" for... what?|
... but... For what is that "Allow, Deny, Reject"? That is the question! We need to link the label with the widget! ;)
|Link label to widget!|
HOW TO FIX IT?
In Glade just link the label to its widget.
By example, you have 1 label for 1 button:
|1 label for 1 button|
Select the label and add an underline in its Label property (Alt+h will focus on that):
Set the underline (checking "User underline") & link the label to the widget (click on the pen and choose your desire widget, button_OS in this case):
|Linking label with button|
Take a look at the official documentation too :) Cheers!