06/15 Fix issues

app/blueprints/i18n/routes.py

@@ -4,6 +4,7 @@ Order: explicit session choice -> authenticated user.locale -> Accept-Language -
 """
 from flask import Blueprint, session, redirect, request, current_app, url_for
 from flask_login import current_user
+from app.utils import safe_referrer
 
 i18n_bp = Blueprint("i18n", __name__)
 
@@ -34,5 +35,4 @@ def set_lang(code):
             from app.extensions import db
             current_user.locale = code
             db.session.commit()
-    target = request.referrer or url_for("main.index")
-    return redirect(target)
+    return redirect(safe_referrer(url_for("main.index")))