Explore batching imports

[iamEAP]

If a large number of files need to be processed at any given time, it's very common for the process to timeout. Rather than performing XLIFF imports synchronously, perhaps it would be better to do them asynchronously or through a batch process.

This might also work around some issues with workbench moderation where some node saves happen at the end of a process, rather than during the initial save.