The message Wikipedia-ios-panel-compare-revisions-text includes this sentence: "When you compare two revisions of an article, the differences between them are generated."
This sounds too complicated and not entirely correct. It could probably be rephrased for clarity or removed.
Perhaps it could say something like "When you ask to compare two revisions of an article, the differences between them are shown".
I'd vote for "Comparing two revisions of an article will show the difference between those revisions by highlighting any content that was changed."
Sounds good to me, the original phrase was tested (positively) at Wikimania, but I'm fine with
"Comparing two revisions of an article will show the difference between those revisions by highlighting any content that was changed."