show freemem in KB, add more HA icons

src/emsdevice.cpp

@@ -34,7 +34,9 @@ static const __FlashStringHelper * DeviceValueUOM_s[] __attribute__((__aligned__
     F_(minutes),
     F_(ua),
     F_(bar),
-    F_(kw)
+    F_(kw),
+    F_(kb),
+    F_(seconds)
 
 };