GUAC-1038: Add SSH "command" parameter to translation strings and protocol JSON.

guacamole-ext/src/main/resources/org/glyptodon/guacamole/protocols/ssh.json

@@ -58,6 +58,16 @@
             ]
         },
 
+        {
+            "name" : "session",
+            "fields" : [
+                {
+                    "name"  : "command",
+                    "type"  : "TEXT"
+                }
+            ]
+        },
+
         {
             "name"  : "sftp",
             "fields" : [