Add vietnamese language

[dungphanxuan]

Done 90%

[dungphanxuan]

@pschlan I have updated the Vietnamese language and added Japanese and Korean languages, please see the changes and help me merge the code

[ShimadaNanaki]

@dungphanxuan @pschlan
I'm creating my repository in Japanese one right now, should I stop editing once I'm done? I'm Japanese and I'm trying my best not to use a translator, so I think it'll take a long time...

[dungphanxuan]

@B4kedBr3ad Hi, I found that using Google translate, the content is correct over 90%. Not much semantic error, You can refer to it first and then edit the content for the meaning, so it saves a lot of time.

[ShimadaNanaki]

@B4kedBr3ad Hi, I found that using Google translate, the content is correct over 90%. Not much semantic error, You can refer to it first and then edit the content for the meaning, so it saves a lot of time.

Not90%, it's 50%

[pschlan]

Thanks for this, will review/merge ASAP!

[dungphanxuan]

Hi @B4kedBr3ad
I have this api/languages/ja.php (Copy from file api/languages/ja.php) file I want to translate into Japanese language. Can you help, thank you

[ShimadaNanaki]

There are quite a few things that need to be corrected in Japanese, so we think it would be better to push once and then correct them. What do you think?
@dungphanxuan @pschlan

[pschlan]

There are quite a few things that need to be corrected in Japanese, so we think it would be better to push once and then correct them. What do you think? @dungphanxuan @pschlan

I would prefer to merge this to the main branch only when it is in good shape. Until then, we can keep it in a branch / PR.
Another idea would be to have separate PRs for the different languages - might make it easier to merge the finished ones early.

[ShimadaNanaki]

Okay, let's split it up by language.