Transkribus/TWI-edit

EditInterface: Navigating to next page should alert user of unsaved changes

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If there are changes on the current page and the user moves to a different page using the navigation possibilities on the edit interface (either arrows, slider menu or entering the new page number by hand), they should receive an alert that there are unsaved changes and confirm to save them (into new version of transcript) or abort them.

The browser default warning has been added now.