update Dutch lang file and add small clarification to the manual regarding the PM release setting units

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14391 a1c6a512-1295-4272-9138-f99709370657

apps/lang/nederlands.lang

@@ -3516,19 +3516,16 @@
 </phrase>
 <phrase>
   id: LANG_PM_UNITS_PER_READ
-  desc: in the peak meter menu
+  desc: DEPRECATED
   user:
   <source>
-    *: "Units Per Read"
-    masd: none
+    *: ""
   </source>
   <dest>
-    *: "Eenheden per keer"
-    masd: none
+    *: ""
   </dest>
   <voice>
-    *: "Eenheden per keer"
-    masd: none
+    *: ""
   </voice>
 </phrase>
 <phrase>
@@ -10971,3 +10968,17 @@
     *: "Enkel bij tonen alle bestanden"
   </voice>
 </phrase>
+<phrase>
+  id: VOICE_PM_UNITS_PER_TICK
+  desc: spoken only, peak meter release unit
+  user:
+  <source>
+    *: ""
+  </source>
+  <dest>
+    *: ""
+  </dest>
+  <voice>
+    *: "eenheden per tick"
+  </voice>
+</phrase>

manual/configure_rockbox/display_options.tex

@@ -232,6 +232,7 @@
       \item[Peak Release:]
         This determines how fast the bar shrinks when the music becomes
         softer. Lower values make the peak meter look smoother.
+        Expressed in scale units per 10ms.
       \item[Peak Hold Time:]
         Specifies the time after which the peak indicator will reset.
         For example, if you set this value to 5s, the peak indicator displays