You probably need to tell Semper which languages you understand.
When Semper first starts, it tries to guess which languages you speak. When you browse for a new pack, it limits the packs it offers to those that use one of your languages to teach you something (usually another language). For most users, the language guessing works great, but sometimes it does not.
To adjust your languages, go to "Account" (in the upper right corner) >> "My languages".
Simply check the languages you understand and want to have packs in. Go back to save your selection.