Fix not calculating size correctly for site inserts
Fix error message just after cancelling: It is possible to call callbacks while stopping (we wait for the actual segment encodes to stop, but can't stop the callbacks)
Fix l10n strings
Fix another minor insert bug
Test splitfile with segments with 128 and 1 blocks
L10n error messages
Rename FCPClient to PersistentRequestClient
Rename FCPPersistentRoot -> PersistentRequestRoot