Improve usability of the import process
At the moment, it is not very clear what to do during the import process. Especially the data source form seems a bit confusing at first.
The following things should be done to improve usability of this form:
- Add some explanatory texts to the form.
- Outsource some of the more "exotic" form fields to an "advanced settings" form that is initially hidden and fill these input fields with reasonable default values (e.g. MySQL as driver, utf8 as character set, etc.)
- Split up database and file connection into two seperate steps?
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