Japanese translation added

[hirotake111]

This is a PR to add Japanese to a language option as requested in issue #60.

As @GyulyVGC mentioned here it needs additional font files to be able to display the Japanese language on Sniffnet as expected. Please proceed.

If you have any questions, feel free to contact me anytime 😄

[GyulyVGC]

I've added the Japanese glyphs.
Please let me know if everything is displayed as it's supposed to be.

I've also noticed that some sentences are missing in the file translation_2.rs... could you add them? (If they are supposed to be equal to English add them to the English arm of the match clause, otherwise please add a new arm).

[hirotake111]

@GyulyVGC

Please let me know if everything is displayed as it's supposed to be.

Thanks for your support. I looked at it and everything looks good now.
(I fixed some words as those sound weird.)

As you requested, I also filled in some missing parts in translation_2.rs 😄

[GyulyVGC]

I'm happy that Sniffnet finally has a Japanese translation, the last popular language among the app users that was still missing 🎉

Thank you very much!

[GyulyVGC]

@all-contributors please add @hirotake111 for translation.

[allcontributors]

@GyulyVGC

I've put up a pull request to add @hirotake111! 🎉