Word field improvements

[artjomsR]

Partially fixes https://github.com/FreeLanguageTools/vocabsieve/issues/107 by setting the contents of Word field with whatever was searched if both dict groups return nothing.

There's still a scenario where target is not found in the 1st group but found in the 2nd. Currently, the Word field mirrors whatever is defined in the 1st group. To get around this, I was thinking the following: always pass word_widget to MultiDefinitionWidget. In addition, pass lookup1_result_success to MultiDefinitionWidget.setCurrentDefinition(). If lookup1_result_success == False, then set the Word field with the contents of the result of the 2nd group, assuming that something was found. Thoughts?

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I've also allowed Ctrl+D to work on the Word field, to make it easier to search for words in case it didn't find the correct lemma on the 1st try

[1over137]

I think the proper behavior should be: Word field changes with whatever user decides to switch to, in first or second definition field. Also, if nothing was found at all, presumably it should be populated with whatever is being looked up for convenience. What is the current behavior with this patch?

[artjomsR]

Current behaviour is:

• If definition1 is found, populate Word with that value
• Otherwise, Word is left blank (regardless whether definition2 is found or not)

This PR changes so that if neither definition1 or 2 are found, then it populates Word field with whatever the user searched for (as you say in your comment)

However, this PR doesn't address that Word field will be blank if definition2 is found