Refactor gimp-help-2.doap to gimp-help.doap
Commit aa7e73f9 seems to have renamed gimp-help-2.doap to gimp-help.doap, but I still see a lot of references to gimp-help-2.doap in the code, which blocks zh_CN from compiling. (It gives me No rule to make target 'gimp-help-2.doap', needed by 'MAINTAINERS'.
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I think I caught all of them with the patch attached. Tell me if I screwed something up.