Some users (including myself) don't really use the "Rank" feature as a member ranking, but instead let their users set their own text for the rank, providing more of a member title feature. However, the profile page will still list this as a "Rank", leading to confusion.
This plugin replaces the word "Rank" with whatever you have set for the custom rank name in your language settings – in a default installation this is "Title" – saving you the trouble of having to split your website language or edit a template, just to change a string.
Tested on IPS 4.1.10.
Update: This plugin doesn't work on the latest version of IPS (as of around September 2017). This is because it is no longer necessary – the "Rank" label on the profile page is now an editable language string.