http://www.ibresource.com/?pg=tuts&lang=0&CODE=02&id=15======================================================================================
How to create, translate, and Import a language pack for a v1.1.x Install
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[Step 1] Open you’re Admin CP and Goto:
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>> Manage Languages > Base new language set on... > English > Done.
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[Step 2] Edit Language set Info:
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>> Language Set Name: Language Name goes here
>> Language set author name: Your name as the author of the language pack
>> Language set author email: Input your email address here
>> Click the button [edit language set details]
>> Click the "Go to: Manage language sets" link
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[Step 3] Notice that a new language pack entry has been created:
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>> Click the "edit" link for your language pack
>> Notice the "Please select a language file to edit" area, there are a list of all language files relating to the language pack.
>> Choose the first one, "repeat words" and click the [edit this language file] button
>> Starting at the top, begin to translate all words from the existing English language, to the language of your choice. When you have finished that, click the [edit this file] button to save your work on that file.
>> as before, click the "Go to: Manage Language Sets" link and repeat the process again, this time choosing the second language file instead of "repeat words" which should be "lang_ucp".
Continue to translate all language files in that area until you have done them all.
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[Step 4] On your left admin bar, again choose "Manage Languages"
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>> Now that editing is complete, click the "export" link to the right of your language file name, you will then be directed to download your language pack as a .tar archive file. Just save it to your desktop.
>> You should now have a file on your desktop called "lang_xxxx.tar" (xxxx being the name of your language).
You are now done with the language file and may import it to any v1.1.x InvisionBoard by uploading that .tar file to your "archive_in" directory and then going into your Admin CP and choose "Import a Language". Then find your language in the dropdown list then click the [import] button to complete.