3.1.3 firmware for Prusa i3 MK2.5

This is final version of 3.1.3 firmware for MK2.5.
Previous firmware version (https://github.com/prusa3d/Prusa-Firmware/releases/tag/v3.1.3-RC1) was initial firmware version for MK2.5.

Changes with respect to 3.1.3-RC1 for MK2.5:

Temperature calibration fixes:

Current version of temperature calibration works best without steel sheet.
At the beginning of temperature calibration, user is asked if there is steel sheet on heatbed. If he chooses "yes" option, he is asked to remove steel sheet and printer waits for knob pressing. In previous firmware version, there was no movement in Z axis during this procedure and thus removing steel sheet was often difficult and usually only option was to restart printer, move Z manually and then start calibration again.
In current firmware version, if user chooses that steel sheet is on heatbed, printing head moves to certain position which makes it possible to easily remove steel sheet and waits until the user removes steel sheet and presses the knob.

If printer hasn't been homed yet (position of nozzle is not known yet) and user starts temperature calibration, there is auto home at the beginning. Printer first homes x and y axes and then, moves to certain xy position and then z axis homing proceeds. PINDA probe should be above left front calibration point when homing Z axis without steel sheet. In previous firmware version, PINDA probe has some offset in Y axis, which caused, that PINDA probe triggered lower then desired and nozzle could touch heatbed after auto home without steel sheet and then damage heatbed surface when temperature calibration proceeds. In current firmware version auto home position has been corrected and nozzle on correctly assebled printer is now always in safe distance from heatbed after auto homing without steel sheet.

Other changes:

• Czech language translation corrected
• "Development version" warning message removed