On translatable pages on the wiki -- it took a lot of work by emanuele to make them translatable.
More work than should be required.
This problem began because of some unknown problem with the translation "extension" to the wiki.
I think that what is really needed to fix the problem is to update the wiki to the current version, and to the current version of the translate extension.
Before doing that, we need to be able to install a test wiki, with these extensions, in the same environment that the current one is running.
We do not currently have people to set this up so we can test it.
If we can update the wiki, we can look at making more pages translatable with the translate extension. Until then, it would be quite difficult.