Show a warning to people having a corrupted file storage

_locales/en_US/messages.json

 {
   "add": {
     "description": "This is the label for the 'Add' buttons.",
     "message": "Add"
   },
   "add_domain_button": {
     "message": "Add domain"
   },
   "add_filter_button": {
     "message": "Add filter"
@@ skipping 93 matching lines @@
     "message": "View list"
   },
   "firstRun_acceptableAdsExplanation": {
     "description": "This is the explanation of the acceptable ads feature",
     "message": "<strong>Adblock Plus will always block annoying ads.</strong> Still, we want to encourage websites using plain and unobtrusive advertising. That's why we have established <a>strict guidelines</a> to identify acceptable ads, and allow these out of the box. You can always <a>disable</a> this if you want to block all ads."
   },
   "firstRun_changelog": {
     "description": "Page subtitle, links to the changelog",
     "message": "See what's new"
   },
+  "firstRun_dataCorruptionWarning": {
+    "description": "Help link for people with corrupted data that get the first-run page each time",
+    "message": "Does this page keep showing up? <a>Click here!</a>"
+  },
   "firstRun_feature_acceptableAds": {
     "description": "One of the bullet points in the features list",
     "message": "Support websites with acceptable ads (more below)"
   },
   "firstRun_feature_betterSurfing": {
     "description": "One of the bullet points in the features list",
     "message": "Enjoy the web without annoying ads"
   },
   "firstRun_feature_videoAds": {
     "description": "One of the bullet points in the features list",
@@ skipping 101 matching lines @@
     "message": "Subscription title:"
   },
   "update_now": {
     "message": "Update now"
   },
   "whitelisted_domains": {
     "description": "This is a tab heading.",
     "message": "Whitelisted domains"
   }
 }