You need to install the Sense Dictionary for BrailleSense notetakers.
Note: New firmware is required - 8.20 150204 or later. (Feb 2015)
UK Dictionary (includes Thesaurus):
http://himsintl.com/Upgrade/Dictionary/SenseDictionary-UK-Collins.zip
Spanish
www.himsintl.com/Upgrade/Dictionary/SenseDictionary-Spanish-Collins.zip
Arabic version
http://www.himsintl.com/Upgrade/Dictionary/SenseDictionary-Arabic-Collins.zip
Italian
http://himsintl.com/Upgrade/Dictionary/SenseDictionary-English-Italy-Collins.zip
Thesaurus
http://himsintl.com/Upgrade/Dictionary/SenseDictionary-English-Thesaurus-Collins.zip
Step 1: unpack zip file
You will require a licence key, sent by HIMS in a ZIP file.
When you extract this file, you will find a file called "SenseDicAuth.key".
Please copy this file in to the same "HanDictionary" folder.
Then, copy the HanDictionary folder to the root of your U2's flashdisk.
You can open the Dictionary using Backspace-enter-D.