Compare different version loads wrong language

Description

If your site has multiple languages, comparing different language versions of a page results in the wrong language being loaded.

Steps to Reproduce:

1. Enable several languages (5 or 6) on an alloy site.
2. Create language versions of content in those languages.
3. Start comparing on all properties mode.
4. Keep changing the language. After a couple of changes, you will notice the wrong language being loaded.
5. It starts working again if you keep on comparing. But after some time, the problem re-appears. (You may have to reload the page.)

Note: This is only reproducible if there is high latency on XHR requests on the machine.