YH8xx,YH9xx: Keymap improvement

The main "innovation" in this patch are two "virtual buttons"
for the record switch on YH92x targets. When the switch state
changes, a single BUTTON_REC_SW_ON or .._OFF button event will
be generated. Thus keymap code can react on switching, but
not on the actual state of the switch.

Wherever sensible, the following user scheme is applied:
- use PLAY as confirm button
- use REW button or Long REW to exit
- use REC (YH820) or FFWD (YH92X) as modifier key for button combos

Change-Id: Ic8d1db9cc6869daed8dda98990dfdf7f6fd5d5a1

apps/lang/esperanto.lang

@@ -4318,11 +4318,13 @@
     *: "OFF To Revert"
     vibe500: "CANCEL To Revert"
     mpiohd300: "MENU To Revert"
+    samsungyh*: "REW = Revert"
   </source>
   <dest>
     *: "OFF Por Malvalidigi"
     vibe500: "C Por Malvalidigi"
     mpiohd300: "MENU Por Malvalidigi"
+    samsungyh*: "REW Por Malvalidigi"
   </dest>
   <voice>
     *: ""
@@ -4404,9 +4406,11 @@
   user: core
   <source>
     *: "The disk is full. Press OFF to continue."
+    samsungyh*: "Disk full. Press LEFT to continue."
   </source>
   <dest>
     *: "Durdisko plena. Pesu OFF por kontinui."
+    samsungyh*: "Durdisko plena. Pesu LEFT por kontinui."
   </dest>
   <voice>
     *: ""