This plugin causes language issues in Admin Panel.
I have a clean installation with only ADA Plugin active, using TwentyEleven, using only English front-end and back-end.
When I turn on ADA Plugin, the languages problems appear. When I turn off ADA Plugin, they go back to normal.
Here is a screenshot of the Users panel, so you can see what I mean. There are non-English words appearing because of this plugin.