Do I need my blackberry chinese and korean characters? if I delete them will there be any harm? will I gain any memory space? or does none of this even matter?
You don't need them if you don't use them, you can go to DM and in app loader delete all the languages you don't use...it frees up significant amount of memory
You can also delete them from your berry. Options>applications>delete the languages you won't ever use. Just be careful. If you have a doubt about what it is don't delete it. Erase the wrong file in there and your phone is a brick.
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