Add zh_TW Traditional Chinese translation

[PeterDaveHello]

Thanks for this awesome tool, I'd like to see it have Traditional Chinese interface, so here we got this pull request 😄

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[CLAassistant]

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[barbeau]

Hey @PeterDaveHello, thanks for the translation!

I use Transifex for translation so please follow the instructions here:
https://github.com/barbeau/gpstest/blob/master/TRANSLATIONS.md#transifex

Thanks!

[PeterDaveHello]

Hi @barbeau,

Thanks for the info! I’ve encountered some issues with Transifex before, so I was wondering if it’s possible to merge this PR first and then import the content into Transifex. For future minor updates, I can definitely use Transifex without any problem.

Thanks for considering this! Also, thanks for your effort on the project!