l10n: vi.po: update to v1.7.12-146-g16d26
l10n: vi.po: update to v1.7.12-146-g16d26

 * 2 new messages
 * review messages again (8 of them by Duy) and fixed typo

Signed-off-by: Tran Ngoc Quan <d2635f9f6be81b9042e1c1be60d20ebe0e16c7e2@gmail.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git