Change "Do not load" label to "Ignore"

Expressing this in the positive instead of doing it as a negation "Do not load", should facilitate understanding by users. Suggested by Jon Jones in PCP-663.

The previous situation, expressing this in the negative ("Do not load") required some mental gymnastics. We hope expressing the purpose of this list in a positive way (it "skips" things...) will make it more intuitive for users.