Turn report screen into a modal (#3965)

app/javascript/mastodon/locales/en.json

@@ -136,10 +136,10 @@
   "privacy.unlisted.long": "Do not post to public timelines",
   "privacy.unlisted.short": "Unlisted",
   "reply_indicator.cancel": "Cancel",
-  "report.heading": "New report",
+  "report.heading": "Report {target}",
   "report.placeholder": "Additional comments",
   "report.submit": "Submit",
-  "report.target": "Reporting",
+  "report.target": "Reporting {target}",
   "search.placeholder": "Search",
   "search_results.total": "{count, number} {count, plural, one {result} other {results}}",
   "status.cannot_reblog": "This post cannot be boosted",