Fix difficult translation for other languages (go-gitea#24070)

Fix go-gitea#24051 (comment)

---------

Co-authored-by: silverwind <[email protected]>

Author: lunny

options/locale/locale_en-US.ini

@@ -1713,7 +1713,7 @@ pulls.delete.text = Do you really want to delete this pull request? (This will p
 
 milestones.new = New Milestone
 milestones.closed = Closed %s
-milestones.updated = Updated
+milestones.update_ago = Updated %s
 milestones.no_due_date = No due date
 milestones.open = Open
 milestones.close = Close

templates/repo/issue/milestones.tmpl

@@ -88,7 +88,7 @@
 							{{svg "octicon-check" 16 "gt-mr-3"}}
 							{{LocaleNumber .NumClosedIssues}} {{$.locale.Tr "repo.issues.closed_title"}}
 							{{if .TotalTrackedTime}}{{svg "octicon-clock"}} {{.TotalTrackedTime|Sec2Time}}{{end}}
-							{{if .UpdatedUnix}}{{svg "octicon-clock"}} {{$.locale.Tr "repo.milestones.updated"}} {{TimeSinceUnix .UpdatedUnix $.locale}}{{end}}
+							{{if .UpdatedUnix}}{{svg "octicon-clock"}} {{$.locale.Tr "repo.milestones.update_ago" (TimeSinceUnix .UpdatedUnix $.locale) | Safe}}{{end}}
 						</span>
 					</div>
 					{{if and (or $.CanWriteIssues $.CanWritePulls) (not $.Repository.IsArchived)}}