page: translated donate image description

src/localization/languages/en.json

@@ -158,6 +158,7 @@
         "UrgentTwitterPatch": "fixes and easier downloads",
         "StatusPage": "service status page",
         "TroubleshootingGuide": "self-troubleshooting guide",
+        "DonateImageDescription": "cat sleeping on a laptop keyboard and typing letters repeatedly",
         "UpdateNewYears": "new years clean up"
     }
 }