Interface crashes when selecting too many files

[Popolechien]

I had about 20 small files on my list and then clicked "update" and got this error log: ´´´ Request Method:	GET

https://cardshop.hotspot.kiwix.org/configurations/2 2.1.2 KeyError 'tw' ./manager/templatetags/manager.py in , line 56 /usr/local/bin/uwsgi 3.6.6 ['.', '', '/usr/local/lib/python36.zip', '/usr/local/lib/python3.6', '/usr/local/lib/python3.6/lib-dynload', '/usr/local/lib/python3.6/site-packages'] Thu, 18 Oct 2018 13:16:53 +0000

Error during template rendering In template /app/manager/templates/base.html, error at line 0

1	{% load static %}