What to do when a word is not found
What Ronald did for the library he was associated with was to write what amounts to an "alternative spelling" function. There are plenty of examples of how this can be done; Google is one of the examples that comes to mind..
For WiktionaryZ, it will not be as straight forward as it is for a monolingual resource. When a word is not found, it is important to know what language this word should be in. Also, WiktionaryZ is lacking many words that you would expect in a resource that want to include all words. This is best demonstrated that of the 1000 most popular words in English, several are still missing..
When a word is not found, it would be cool to have functionality that helps us to understand what the problem is. The first thing would be to aggregate the number of misses. It would be as cool to have the number of hits because it is in the percentages where we will find how well we do.
The words most often not found are the words that are the most relevant to add to WiktionaryZ. This will improve its function as a resource.