With TV Pack you should be able to combine channels together. Its through the Tasks->Settings->tv->guide->Edit Channels->select channel you want to combine (to get to the edit channel page)->Edit Listings->choose the channel to combine into and then choose the combine option.
In WMC TVP8 (and other media centers) there's only one description stored for the program. The downloaded listings only come in one language. But the inband guide data extracted is in the language that it is sent in. So the guide can contain multiple languages, but each program entry will only be in one language.
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