Massive codebase edit to coincide with the material design release. Material design UI is provided by the KivyMD library. There is a caveat: bottomsheet.py is a modified version of the slide-up menu provided by KivyMD with a patch for button activity that was not merged into the master repo. Functionality is the same otherwise.
Get updates easily by downloading from Google Play: https://play.google.com/store/apps/details?id=voltisoft.apps.caltracapp&hl=en
F-Droid has no current implementation for Python4Android projects so I cannot upload via them.