Move "about osm" to about page, add option to clear tile caches, option to add reason when deleting, min zoom 16 for edits/submissions, 300km nav distance warning

lib/localizations/en.json

@@ -132,7 +132,9 @@
     "editQueuedForUpload": "Node edit queued for upload",
     "deleteQueuedForUpload": "Node deletion queued for upload",
     "confirmDeleteTitle": "Delete Node",
-    "confirmDeleteMessage": "Are you sure you want to delete node #{}? This action cannot be undone."
+    "confirmDeleteMessage": "Are you sure you want to delete node #{}? This action cannot be undone.",
+    "deleteReasonLabel": "Reason for Deletion (Optional)",
+    "deleteReasonHint": "e.g., device removed, incorrect location, duplicate..."
   },
   "addNode": {
     "profile": "Profile",
@@ -282,8 +284,11 @@
     "needsApiKey": "Needs API key",
     "editProvider": "Edit Provider",
     "addProvider": "Add Provider",
-    "deleteProvider": "Delete Provider",
+    "deleteProvider": "Delete Provider", 
     "deleteProviderConfirm": "Are you sure you want to delete \"{}\"?",
+    "clearCaches": "Clear Caches",
+    "clearCachesConfirm": "Clear all tile caches for \"{}\"? This will free up storage space but tiles will need to be downloaded again when viewing those areas.",
+    "cachesCleared": "Caches cleared for \"{}\"",
     "providerName": "Provider Name",
     "providerNameHint": "e.g., Custom Maps Inc.",
     "providerNameRequired": "Provider name is required",