I tried using this tool to reconcile a list of about 100 church denominations (a gist can be found here). Unfortunately, the results were pretty mediocre (only around 5 got matched) because the list is in Dutch while the matching is done using only English labels.
I think it would be a very useful addition to make sure it's possible to set up the language code. For both the OpenRefine reconciliation endpoint as well as the WD query service this is very easy. Also see my wdreconcile tool for some inspiration on how something like that could be done.