1. Go to the page for a distribution source package that is not currently linked to an upstream project.
2. Choose "Set upstream link".
What happens:
* You arrive at a page with the heading "Define upstream link".
* The form label says "Product Series".
* The caption says "The best guess we have as to the Launchpad ProductSeries [sic] for this Source Package [sic]. Try find [sic] packaging information for this specific distroseries [sic] then try parent series and previous Ubuntu series."
* The button says "Change".
What should happen:
* If the page heading and the link to the page both use verbs, they should be the same verb unless there's a really good reason for them to differ. "Define" is not an appropriate verb for this task. A better heading would be "Link to an upstream project".
* The form should not refer to things that don't exist in Launchpad, such as "product series".
* The form label should use standard Launchpad capitalization and punctuation, i.e. "Project series:" rather than "Product Series".
* The language should be free from grammar errors.
* If possible, the button should not suggest you are changing something that didn't exist beforehand.
Fixed in launchpad devel r9789.