Make arguments like Context.GrobName accessible as symbol lists

Documentation/de/notation/keyboards.itely

Index: Documentation/de/notation/keyboards.itely
diff --git a/Documentation/de/notation/keyboards.itely b/Documentation/de/notation/keyboards.itely
index 065d9746032fb6a2c6a725066e0bbbfd2da358bd..03029ddb31626f78d8f4c0d77b913bc1a075d818 100644
--- a/Documentation/de/notation/keyboards.itely
+++ b/Documentation/de/notation/keyboards.itely
@@ -10,7 +10,7 @@
 
 @c Translators: Till Paala
 
-@c \version "2.16.0"
+@c \version "2.17.6"
 
 @node Tasteninstrumente und andere Instrumente mit mehreren Systemen
 @section Tasteninstrumente und andere Instrumente mit mehreren Systemen
@@ -229,7 +229,7 @@ Notation kommen:
   \new Staff = "up" {
     \voiceOne
     % Make space for fingering in the cross-staff voice
-    \once\override DynamicLineSpanner #'staff-padding = #3.4
+    \once\override DynamicLineSpanner.staff-padding = #3.4
     e''2\p\< d''\> s1*0\!
   }
   \new Staff = "down" <<
@@ -463,11 +463,11 @@ Hälsen, die nach unten zeigen.
       << {
         \clef bass
         % stems may overlap the other staff
-        \override Stem #'cross-staff = ##t
+        \override Stem.cross-staff = ##t
         % extend the stems to reach the other staff
-        \override Stem #'length = #12
+        \override Stem.length = #12
         % do not print extra flags
-        \override Flag #'style = #'no-flag
+        \override Flag.style = #'no-flag
         % prevent beaming as needed
         a8 g4 f8 f bes\noBeam g4
       }