Kotlin caused scroll performance degradation, reverted to plain Java. Added refresh button

Change-Id: Ia8b6d0c8c28015c31f157dca9527bf63c57fe0ca
fixed some minor errors

Change-Id: I4a48d291e1b08aa87a0ed555cd6c0027651d5475
minor touchup of article listing

Change-Id: I2693d91f7db16ebb1565902a611db4f200a57144