New firmware version for TachoDrive4 & 5

The firmware is marked with 2.81 for TachoDrive4 and 1.20 for TachoDrive5 respectively.

The changes introduced are:

v1.20 TD5

• Analysis of the control card activity has been added.
• Driver (non-workshop) card analysis added for no entries of the place where work started and ended.
• Portuguese language translation has been updated.
• Support for files with a longer name has been improved.
• Other minor fixes have been introduced.
  

v2.81 TD4

• Analysis of the control card activity has been added.
• Driver (non-workshop) card analysis added for no entries of the place where work started and ended.
• Screen "Disconnect tachograph!" Has been added after trying to add a vehicle to the control database.
• Support for files with a longer name has been improved.
• Other minor fixes have been introduced.