Updating the Manual tests procedure with clarifications

[microbit-carlos]

• Updates the translations list
• Clarifies the difference between the two test cases named module.py file can be loaded by file picker and used in main.py
• Removes steps remove the (repeating) steps to flash the hex file and check that it works in the multiple test cases that load module.py using different methods. If the first time it was added to the filesystem works, then all the other tests cases will work too.
• Updates the WebUSB test cases to indicate they should be run with a micro:bit V1 and a V2.

@microbit-mark would you be able to review this for me? Thanks!

[microbit-mark]

LGTM 👍🏻 Thanks @microbit-carlos

[microbit-carlos]

Thanks Mark!