OpenAI GPT Custom Instructions: Instruction set selection for LR

Another Icon is added to the Language-Resource Element between the "Model Properties" and the "Trainings Window". This icon opens a selector, where a custom instructionset can be selected (all are shown with their name & comment). On top is a information text pointing at the current instruction-set: Current instructions: "Bla Bla Bla". When nothing is selected, then Current instructions: "translate5 default" is shown. This item "translate5 default" is also the first item in the selector list to be able to reset to the default. The icon is attached in this issue