Removed accidentally duplicated function in hints.js.
Show image title or alt in hint label.

This allow the user to filter the hints. The hints where already filtered by
the image title or alt attributes, but they aren't visible normally so this
made less sense. But now the title or alt attributes content is visible in
hinting mode.
All to filter link hints also by the title or alt of image.

Show the images title or alt attribute in hint label if the link contains no
text content.