Task #3801, Stage #20 - Vocabulary Builder app

Let’s add the required constants to the file src/external/redux/constants.
DELETE_LIST, DELETE_WORD - the value of all constants is equal to their name.
Export two more functions from src/external/redux/actions: deleteWord, deleteList.
Each must return an object with fields type and payload.
The type field is equal to the constants DELETE_WORD and DELETE_LIST, respectively.
payload equals a single argument to each function, respectively.
In the same place we will add a request method fetchWord with three arguments: the word to search for, listKey and the object navigation.
This method must return an asynchronous function with one dispatch argument.
First dispatch the action for the loading field with the value true.
Then we make a request using fetch, the url of which is obtained from the getFetchWordEndpoint method.
If the answer is no error, dispatch the addWord action with the result of the response and listKey, dispatch setError with the argument null and call the method navigation.goBack.
If the response is an error, dispatch the setError action with this error.
Always dispatch setLoading with the value false at the end.

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