There are some messages of Yumex (2.0.3), that are probably hard coded, so it's impossible to translate them. In the .po, the msgid "available", "installed", "updates" and "all" (which appear with "Getting : %s") don't exist and it's problematic for translate "Found %d %s packages" to others language (in my case, the french).
I made some changes to the stings upstream to make it easier to translate. Ex. Found %d %s packages is split into Found %d update packages Found %d installed packages etc. If you other insane string, then let me know.
Thanks for the correction. It should be OK now. As I'm not translating Yumex either plan to translate it soon, I can't say if all the strings can be translated in a intelligible way. If not, I will reopen this bug.