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I think the only thing you can get from the KoboReader.sqlite database is a list of words you looked up. In the "AnalyticsEvents" table you can search for entries with type "DictionaryLookup". Apart from the date in the "Timestamp" column, the word you were looking for is stored in the "Attributes" column, e.g. {"Dictionary": "en", "Word": "zoo"}. However, I couldn't find the corresponding translations anywhere in the database. So, you would have to get those from somewhere else.
Since I deactivated analytics before I updated the firmware, I can't tell if this still works with the latest firmware - my entries are limited to the first week after I purchased my Kobo Glo HD.
Another place to search for words you have looked up in the dictionary before might be the Kobo eReader.conf file. In the [General] section there is a "DictionaryRecentSearches=..." entry. It seems to only list the words from the dictionary search (not the words you looked up using a long press on a word in an e-book) - regardless if a definition was found or not.
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