Harmonize JSON API error messages

resources/lang/en.json

@@ -68,8 +68,10 @@
 	},
 	"error": {
 		"commit_db": "Error committing to database",
+		"file_missing": "$0 file \"$1\" is missing",
 		"impossible_value": "Value \"$0\" is not valid for field \"$1\"",
 		"no_auth": "Not authorized",
+		"not_found": "Unknown action",
 		"unknown_field": "Unknown field \"$0\""
 	},
 	"feed": {
@@ -185,8 +187,16 @@
 		},
 		"mode_archived": "Project \"$0\" is archived. Uploads are not allowed.",
 		"position": {
+			"determining": "Determining position…",
+			"error": "Unable to determine position",
 			"new": "New position",
-			"title": "Add position"
+			"permission_denied": "Location permission was denied",
+			"sending": "Sending position…",
+			"success": "Position uploaded successfully",
+			"timeout": "Position request timed out",
+			"title": "Add position",
+			"unavailable": "Position is unavailable",
+			"unsupported": "This browser does not support geolocation"
 		},
 		"success": "$0 uploaded successfully"
 	},