This should be a minor revision. Just focus on what you think should be improved regarding research questions or objectives, theoretical background, improvement in the relevant studies of each variable you used in your paper, and so on.
We do not really know what they mean but it probably does not matter so much; hopefully only a few minor modifications required for getting your article published. I agree with the others, though, that a limit of 14 days sounds very much like what some journals would call a minor revision.
The numbers of days given to effect the corrections does not determine whether is a major or minor correction. The major correction is a correction that when ommitted or allow to stand will significantly affect the results of the study. Time given may just be based on reviewers schedule of activities.