Task 8.20 UI Improvements (PC/Mobile): /calendar

[g33ya]

• Add coloration to download select buttons to make it more clear when an event is selected
• Increase spacing between filter message and calendar message
• Update download all button to convey the functionality better
• Make it so select buttons and event numbers only appear when you press download events button
  • They should disappear after downloading events
• Make it clearer when message is sent in DM