When importing a file with translations where they keys contain dots the import process breaks. A JS method uses the key as HTML-ID to identify entries for setting their import state icon. The dot invalidates the HTML-Id which leads to this problem.
A conversion to a valid HTML-ID must take place and on the other side a re-conversion must be done. They original key value must be used inside oTranCe itself, but a converted value must be used to identify the entry on the import screen.