After a filetranslation in InstantTranslate is finished (= right after the translation is done),
- remove the assocs to the LanguageResources that the task has used (remove the assocs only, not the LanguageResources!),
- and log the removals in the task-log (so we can still check which LanguageResources have been used for the translation).
- The tasks for filetranslations are hidden; when the assoc is removed, these tasks will no longer be visible in the LanguageResources' list of associated tasks.
- LanguageResources can be removed even if the hidden task for a filetranslation still exists and can be exported.
Update IP 2020-04-15: Assocs are removed also after import stops with an error.