adding title for "Add package" button tooltip
adding title for "Add package" button tooltip

switch-education/pxt,playi/pxt,Microsoft/pxt,playi/pxt,switch-education/pxt,switch-education/pxt,switchinnovations/pxt,switchinnovations/pxt,switchinnovations/pxt,switchinnovations/pxt,Microsoft/pxt,Microsoft/pxt,switch-education/pxt,Microsoft/pxt,playi/pxt,Microsoft/pxt,playi/pxt,switch-education/pxt