Per the parent; we're expecting to do this on the site in the first week of September, so any time after that would be great.
(This'll also distinguish more clearly between saved offline pages and images against publishing online changes to pages, which is nice.)
From https://github.com/wikimedia/apps-android-wikipedia/blob/master/app/src/main/res/values/strings.xml I think the main strings to change are:
For consistency, ideally we'd also change:
And possibly some places I missed.