Bug: = in term name causes Unload Unused Languages At runtime to remove things

If there is any term that uses an "=" equal sign in the name, the unloading unused languages code will parse that incorrectly on reading in the cached version.

I worked around this by setting Export_Language_to_Cache and Import_Language_from_Cache to use something longer and more like the rest of i2's conventions instead of just an "=" to separate term name and language value.

FYI The fix is probably a bit more complicated than my first post implied. After a bit more testing we found that iOS and xbox one was not always deleting the old cache files. So it might need to be versioned if a format change happens.