Update Japanese translation a little
MIME validity checker: Backwards compatibility to older Infocalypse repo's. Will be removed eventually.
Fix NPE handling worked-around MIME type for old infocalypse repo's, throw a more appropriate exception, don't show force-fetch link if the MIME type isn't plausible.
Fix bug #5578.
Hidden files in directory uploads: IncludeHiddenFiles in ClientPutDiskDir, for now always ignore them in fproxy uploads.
Build 1424.
Merge branch 'master' into next

Conflicts:
	src/freenet/node/fcp/ClientPutDir.java
	src/freenet/node/fcp/ClientPutDiskDirMessage.java