duration-length becomes duration-moment, but script no longer works

In running convert.ly from version 2.26.0 on a file that compiles with
2.24.0 I get a change in name from ly:duration-length to ly:duration-
moment. But the typesetting is completely different. The code concerned
is a definition to allow setting the spacing in a graceAfter grace
note. Here is the MWE

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\version "2.26.0"

attachGraces = #(define-music-function (parser location frac note graces) (number? ly:music? ly:music?)
 (if (null? (ly:music-property graces 'element))
	 (begin
	  (ly:warning "No grace notes follow this note the afterGrace will be ignored.")
	  (make-music
		  'SequentialMusic 
		  'elements
		  (list note graces)))
	  ;(make-music 'Music 'void #t))
	 (let ((skip (* frac (/ (ly:moment-main-numerator (ly:duration->moment (ly:music-property note 'duration)))
		  (ly:moment-main-denominator (ly:duration->moment (ly:music-property note 'duration))))))
	   (thegraces  (ly:music-property (list-ref (ly:music-property 
					 (ly:music-property graces 'element) 'elements) 1) 'elements)))
	(define gracenotes (make-music 'GraceMusic 'element (make-music
			'SequentialMusic
			'elements
			thegraces)))
	   (make-music
		  'SimultaneousMusic 
		  'elements
		  (list
		 note 
		(make-music
		 'SequentialMusic
		  'elements
		  (list
			 (make-music
				  'SkipMusic
				  'duration
				  (ly:make-duration 0 0 skip))
				gracenotes)))))))



\score { 
          \new Staff
          << { \attachGraces #3/4 g''4 \grace {f''8} } >>
       } 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

In addition the internationalization (_ "...") no longer works, so 
(ly:warning (_ "No grace notes follow this note the afterGrace will be ignored."))
causes the error message

 _: bad use of '_' syntactic keyword in subform (_ "No grace notes follow this note the afterGrace will be ignored.") of (_ "No grace notes follow this note the afterGrace will be ignored.")

Any ideas?

Richard Shann