i18n: add context to breadcrumbs area label

[timse201]

related to: #78133

can't find the third one.

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[himanshupathak95]

I think it would be better to use this instead -

-			'aria-label' => _x( 'Breadcrumbs', 'area label' ),
+			'aria-label' => _x( 'Breadcrumbs', 'breadcrumb navigation aria-label' )
 		)
 	);

I feel 'aria label' is too generic. A translator encountering it later won't immediately understand this is a screen reader navigation landmark, so I think it is better to make itake it self-documenting.

[Mamaduka]

@himanshupathak95, I think context needs to be short, original string + content should give you the same info as your suggested change. The place where the attribute string is applied isn't important.

can't find the third one.

admin-ui package is shared between routes, but it's bundled, so it can create multiple entries.