Label QTI 1.2 tests as test and use test icon

New QTI 2 tests are now labeled as "IMS QTI 2.1" and have another icon as the "old" tests. For end users this is problematic as they have no clue what IMS QTI 2.1 is and don't click there if they want to make a test. Same with the icon. The current icon is used elsewhere.

Wording: QTI 2.1 are labeled "Test (QTI 1.2)". Old tests are labeled "Test"

Icon: QTI 2.1 new uses the same pencil icon, but to make it distinguishable in the resource listing we use the dark icon for QTI 2.1 while we use the light icon for QTI 1.2