Full Translation to Spanish

The translation of all tags is performed, resulting in the fusion of the locations;
      \
es-AR |
es-ES |==> es.yml
es_US |
      /
Major translations:
Time Tracker = Control de Tiempo
Booking = Reserva de Tiempo
Timelog = Registro de Tiempo
Merge pull request #148 from martinllanos/patch-2

Full Translation to Spanish