Auto-complete tests can fail

[carinedengler]

Describe the bug
In tests/test_selenium/test_token_correct.py, 3 tests are frequently failing, if not every time:

• [TwoCorpora] Test the edition of a token using typeahead
• [Wauchier] Edit morph of a token with allowed values as control

It's generally an issue of autocompleting with the typeahead which does not work

To Reproduce
Steps to reproduce the behavior:

1. Clone the repository
2. Launch the tests (specifically tests/test_selenium/test_token_correct.py)

Expected behavior
Test should not fail (as the UI works outside of these tests)

Additional context
If you think another JS Library might be easier to test AND integrate, feel free :)