Removed the test_hud_closes_on_item_activated test as the same behavior is tested already by test_app_activate_on_enter - redundant.
Made test_app_activate_on_enter work better on non-EN-locale systems by explicitly opening a C locale application for performing the tests. Fixes: https://bugs.launchpad.net/bugs/1076531.
Approved by Timo Jyrinki, Thomi Richards.