outdated translations on startup page
regarding wiki:StartupPageSource?action=diff&version=2296 I think you misunderstood wiki:StartupPageSource?action=diff&version=2252, the string in JOSM was change from "Download" to "Download data", therefore the startuppage was adapted and the translations marked as outdated with the x at the beginning. This approach is written in the comments at the startuppagesource
When changing English text please keep in mind that translations also need to be adapted. If you are not able to do so, then add an "x" in front of the language abbreviation, so the line is still available as draft.