There might be newer versions on the Return of Reckoning Forums.
Step 1: Download your desired language pack from above.
Step 2: Once it’s completed, move it into the Warhammer Online Return of Reckoning folder.
Step 3: Enter the correct /language command to load your desired language (list below). Restart the game and enjoy!
Language Command List
Step 1: Load the game and log in a character.
Step 2: Type in the chat window “/language <language number you desire from the list below>”.
Example:
Change the number value to one of the following:
For English
/language 1
For French
/language 2
For German
/language 3
For Italian
/language 4
Spanish
/language 5
Korean
/language 6
Chinese (simplified)
/language 7
Chinese (Traditional)
/language 8
Japanese
/language 9
Russian
/language 10