Only elide label of hyperlink inset if target and not name given

[Pavel Sanda]

On Tue, Mar 24, 2020 at 11:36:42AM -0400, Richard Kimberly Heck wrote:
> It might help some to replace "Hyperlink:" with ????, the Unicode
> hyperlink character = U+1F517. Though I'm not sure how many fonts have that.

For the fun of it, I tried to put into my .po file as translation but only
empty space is visible in my UI.  
Pavel