Bug 871245 - Don't hardcode "Firefox" in gclicommands.properties. r=dcamp

browser/devtools/commandline/BuiltinCommands.jsm

@@ -1928,7 +1928,7 @@ const { DebuggerServer } = Cu.import("resource://gre/modules/devtools/dbg-server
 gcli.addCommand({
   name: "listen",
   description: gcli.lookup("listenDesc"),
-  manual: gcli.lookup("listenManual"),
+  manual: gcli.lookupFormat("listenManual2", [BRAND_SHORT_NAME]),
   params: [
     {
       name: "port",

browser/locales/en-US/chrome/browser/devtools/gclicommands.properties

@@ -1263,9 +1263,9 @@ profilerNotReady=For this command to work you need to open the profiler first
 # function of the 'listen' command.
 listenDesc=Open a remote debug port
 
-# LOCALIZATION NOTE (listenManual) A longer description of the 'listen'
+# LOCALIZATION NOTE (listenManual2) A longer description of the 'listen'
 # command.
-listenManual=Firefox can allow remote debugging over a TCP/IP connection. For security reasons this is turned off by default, but can be enabled using this command.
+listenManual2=%1$S can allow remote debugging over a TCP/IP connection. For security reasons this is turned off by default, but can be enabled using this command.
 
 # LOCALIZATION NOTE (listenPortDesc) A very short string used to describe the
 # function of 'port' parameter to the 'listen' command.