Plan of the week => Plan for the Week
Planning screen on the web app says "Plan of the Week"
"Plan for the week" is a common phrase in English for weekly planning / calendaring. I suggest changing the phrase to this.
"Plan of the Week" (abbreviated POW) is a less-known phrase used primarily by United States army/navy schools, but I have never heard it used by the general population. The meaning is the same, but it's set by the school, not by the students.
"_____ of the week" can also convey spinning the wheel (like in a gameshow) and seeing what you get, or a winner. Eg. "Deal of the week, feature of the week, employee of the week." I don't think these are intended.