The way this was previously, it had to fail if the GUI language

The way this was previously, it had to fail if the GUI language
was not English: We return the the abbreviated author "One and Two",
but translated to the GUI language; then we search that for " and "
in order to pull the authors apart again.

I've just replaced the distinct routines with a single one that handles
both cases, depending upon whether a Buffer is provided as one argument.

(cherry picked from commit fb84ccd9fb8fbe1eeb764580964a333acb2e6c0d)