This commit adds a rating text field called `rating_avg_text` to display
a text based on the value of `rating_avg` field in `rating.mixin` model.
Here is the text displayed based on the value of `rating_avg`:
1. 'Satisfied' if the `rating_avg >= 3.66`
2. 'Okay' if the `2.33 <= rating_avg < 3.66`
3. 'Dissatisfied' if the `1 <= rating_avg < 2.33`
4. 'No Rating' if the `rating_avg < 1`
Xavier BOL (xbo)
b08dea5aad