Fix NameError: import current_app (bulk_import logged without it)

app/routes/admin.py

@@ -1,4 +1,4 @@
-from flask import Blueprint, render_template, redirect, url_for, flash, request, jsonify
+from flask import Blueprint, render_template, redirect, url_for, flash, request, jsonify, current_app
 from flask_login import login_required, current_user
 from functools import wraps
 from app import db