[Epic] Firmware translations (localisation)

[tsusanka]

We would like to translate both T1 and TT firmwares to help onboard non-English users. We will first tackle this in Core, if porting goes well, we will achieve this in T1 using the Core codebase.

What is most likely obvious but seems better to write it explicitly is that a incorrect translation could lead to a security issue where the user is confirming a different action than intended. We need to be careful.

List of sub-issues:

Slightly in order what needs to achieved first.

• Investigate newlines in layouts Investigate newlines in layouts #1005
• Design signed data blob in storage Design signed data blob for translations #988
• Replace all English strings with identifiers and collect them Replace all English strings with identifiers and collect them #991
• Figure out translations data blob signing process Figure out translations data blob signing process #1016
• Implement data blob exchange mechanism Implement data blob exchange mechanism #1017
• Translate wire errors Translate wire errors #1006
• Create a simple webapp mimicking Trezor screen Create a simple webapp mimicking Trezor screen #993
• Translate bootloader Translate bootloader #994
• Create a Translations report on CI Create a Translations report on CI #992
• Submit strings collection to Crowdin Submit strings collection to Crowdin #1019

[mmilata]

Note: depending on the chosen languages we might have to add additional characters to our fonts.

[Hannsek]

We are moving to the milestone https://github.com/trezor/trezor-firmware/milestone/40