Add Vietnamese translations for log manager

[TanNhatCMS]

WHY

BEFORE - What was wrong? What was happening before this PR?

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AFTER - What is happening after this PR?

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HOW

How did you achieve that, in technical terms?

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Is it a breaking change or non-breaking change?

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How can we test the before & after?

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[pxpm]

Thanks @TanNhatCMS 🙏

[welcome]

WHOOP-WHOOP! Congrats, your first PR on this repo has officialy been merged.

If you want to help out the community in other ways, you can:

• give your opinion on other Github Issues & PRs;
• chat with others in the Gitter Chatroom (usually for quick help: How do I do X);
• answer Backpack questions on Stackoverflow; you get points, people get help; you can subscribe to the backpack-for-laravel tag by adding a new filter; that will send you emails when new questions come up with our tag;

Again. Thank you for the PR. You are a wonderful person. Keep 'em coming :-)
Cheers!

--
Justin Case
The Backpack Robot

P.S. Help in the Backpack community is rewarded with free Backpack commercial licenses. It's the least we can do. If you feel you've helped the community with PRs, help & other stuff, please shoot Tabacitu an email and ask him if you qualify for free licenses. You scratch my back, I scratch your back. Thank you!