Add folder dropping, fix rate limits

- Add folder drag and drop support
- Do expodential retrying if rate limited, allowing upload of very large drive folders
- Do not import deleted files
- Move the upload buttons to their own line
- Notify when no TJA files have been found
- Add more translations

public/src/js/viewassets.js

@@ -175,7 +175,9 @@ class ViewAssets{
 		})
 	}
 	clean(){
-		this.don.clean()
+		if(this.don){
+			this.don.clean()
+		}
 		delete this.ctx
 		delete this.don
 		delete this.fire