Bug 110517 ctrl-k doesn't work in mail/news composer on unix

Changes check spelling binding for unix to ctrl-shift-k
patch by bz and me r=neil sr=sspitzer a=sspitzer

suite/locales/en-US/chrome/common/mac/platformCommunicatorOverlay.dtd

@@ -17,3 +17,5 @@
 
 <!ENTITY findTypeTextCmd.key        "">
 <!ENTITY findTypeLinksCmd.key       "">
+
+<!ENTITY accel.emacs_conflict       "accel">

suite/locales/en-US/chrome/common/unix/platformCommunicatorOverlay.dtd

@@ -15,3 +15,5 @@
 
 <!ENTITY findTypeTextCmd.key        "/">
 <!ENTITY findTypeLinksCmd.key       "'">
+
+<!ENTITY accel.emacs_conflict       "accel,shift">

suite/locales/en-US/chrome/common/win/platformCommunicatorOverlay.dtd

@@ -1,5 +1,6 @@
 <!-- win -->
-<!-- LOCALIZATION NOTE : FILE Do not translate all the Cmd.key and accesskey --> 
+<!-- LOCALIZATION NOTE : FILE Do not translate "accel" or "shift",
+                         You may want to translate the Cmd.key and accesskey --> 
 
 <!ENTITY closeCmd.label			"Close">  
 <!ENTITY closeCmd.key			"W">  
@@ -15,3 +16,5 @@
 
 <!ENTITY findTypeTextCmd.key            "/">
 <!ENTITY findTypeLinksCmd.key           "'">
+
+<!ENTITY accel.emacs_conflict       "accel">