v0.5.1

Changes in the DApp (front-end):

• UI performance optimized for multiple stakes (40+) created by a same user
• Layout fixed for the AssetsCardRow on mobile devices
• Error notification card for failed balance refreshing
• APR gets displayed when a wallet is disconnected
• Balance card layout, when a wallet is disconnected, fixed
• MATIC balance gets updated on the refresh button click
• External links fixed/updated
• Tooltips clarified