I guess the word "extra" made me think there was a base donation. Maybe the second line should display the total % being donated instead of just the the additional donation %. It might already be like that, it's hard to tell because I am an early adopter. I would also remove the term fees from the second line. I understand that technically it's all fees in the pool code but semantically it's not the same thing.
Maybe I am also just making this overly complicated, english is not my primary language. IMHO the second line should just state "You are donating X%" or "You are donating X% of your mined bitcoins"
All excellent points! You are right about that donating of your fees string. Doesnt make much sense now that i think of it. Have a look at it now... should be clearer i hope.
The other comments i will wait to reply on because what i say now will be invalid by the weekend. We are re-doing how this is done now and i think everyone will like the new way better.