Improve track page

[Simon-Laux]

• remove "Click play on a task here to quick start it. The displayed time is the time that was spent on this task in the time frame selected above." - the play and stop icon are understood by everyone

needs extra attention:

• the time frame tabs that were explained by that description are not super clear, explore what we could do to improve it
  • add color to option and times, so that you visually match that those options belong together. could be one color or one color for each tab option.