Simple suggestion for preventing misuse

Hi there,

love your module, however I think there is something that could be improved in order to prevent users from accidently deleting custom strings.

When I re-import packages, I have to check the language textgroup, and then there is that second checkbox that reads something like "clear text groups before re-importing" (hope you get it, I am using the german interface so this is just my rough translation).

Because of what it does, it even says "use with greatest care" - so wouldn't it be best to have this box UNCHECKED by default?
Almost happned to me more than once that I re-imported with that thing still checked, so all my custom translations would be gone....

Best regards from Switzerland,
Robert