The block libmultipart:container does not have a translation in the lang file, so much such as WTHIT don't know what to call it and show "block.libmultipart.container".

...I committed this back here: a0485b8 and forgot to comment on this issue sorry - but this should be fixed in 0.7.2?

You didn't put the json file in the 'lang' directory. It works after I created the directory and moved the file manually.

oh. Thanks for pointing that out, I've moved it into a lang folder in 0.7.3-pre.3.

Using WTHIT with LMP now, this issue appears to be fixed.

I am going to mark this issue as completed, as this seems to be working correctly since 0.7.3-pre.3.