Revert "Make ON/OFF display consistent for Heat"

This reverts commit 43f53e0a40db8d082faa5b15709981b273100f93.
Add test and correct typo
Add Home Axes gcode
Add HOME_AXES_SCRIPT_LEN to account for variations of length in different languages
Translate HOME_AXES_SCRIPT to French
Fix some typos in French translation
Add avr-gcc tip in README
Merge branch 'master' of github.com:hackable-devices/MightyBoardFirmware