Help me about "Test a New Translation (Japanese)"

My Lime Wire version 4.12.
Language: japanese

Following the reference of the page "HOW TO TEST A NEW TRANSLATION",
I am trying to test the new translation, but it doesn't work... 
Since I am struggling for some days but can't figure out the problem yet.
Can you help me???

Problem and what I tried...: 

1. First, I encode the language file from UTF8 into Unicode, which is named "MessagesBundle_ja.properties".
When I launch LimeWire, the language file is ignored and default (English) becomes available instead.
Then, when I click [Language] from the Menu in order to change the language, 
there is NOT the option [Japanese].  ONLY the selection of [Japanese] is missing in the list...

2: Then, I tried... 
The language file is UTF-8, which is named "MessagesBundle_ja.properties". (without encoding it)
When I launch LimeWire, the language file is (taken up) loaded successfully.
But the all letters in the LimeWire got turned in strange characters and it's impossible to read.
There IS an option of [Japanese] in the language selection in the Menu of LimeWire.
(Strictly I can't read, but I can guess and click, then I can see the Japan Flag.)

Note: For encoding, I tried some ways, 
sush as "native2ascii"(Java2 Dev Kit StandardEdition) tool and 2 other "converter" softwares.

What is wrong!?!?

Kay




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