German Cart Broken

Hey guys, the website I’m helping out with is having an issue that I can’t seem to figure out. The french and english versions are perfectly fine, but on the german version of the website the cart button at the top right is broken, as well as adding an item to the cart. It was working fine a couple of days ago, and I haven’t made any changes since then, so I have no idea what the issue is.

### WordPress Environment ###

Home URL: http://www.klur.net
Site URL: http://www.klur.net
WC Version: 3.1.2
Log Directory Writable: ✔
WP Version: 4.8.1
WP Multisite: –
WP Memory Limit: 2 GB
WP Debug Mode: –
WP Cron: ✔
Language: fr_FR

### Server Environment ###

Server Info: Apache
PHP Version: 7.0.17
PHP Post Max Size: 64 MB
PHP Time Limit: 300
PHP Max Input Vars: 16000
cURL Version: 7.21.0
OpenSSL/0.9.8o

SUHOSIN Installed: –
MySQL Version: ❌ 5.5.55 - We recommend a minimum MySQL version of 5.6. See: WordPress requirements
Max Upload Size: 64 MB
Default Timezone is UTC: ✔
fsockopen/cURL: ✔
SoapClient: ✔
DOMDocument: ✔
GZip: ✔
Multibyte String: ✔
Remote Post: ✔
Remote Get: ✔

### Database ###

WC Database Version: 3.1.2
WC Database Prefix: wpkn_
woocommerce_sessions: ✔
woocommerce_api_keys: ✔
woocommerce_attribute_taxonomies: ✔
woocommerce_downloadable_product_permissions: ✔
woocommerce_order_items: ✔
woocommerce_order_itemmeta: ✔
woocommerce_tax_rates: ✔
woocommerce_tax_rate_locations: ✔
woocommerce_shipping_zones: ✔
woocommerce_shipping_zone_locations: ✔
woocommerce_shipping_zone_methods: ✔
woocommerce_payment_tokens: ✔
woocommerce_payment_tokenmeta: ✔
MaxMind GeoIP Database: ✔

### Security ###

Secure connection (HTTPS): ❌Your store is not using HTTPS. Learn more about HTTPS and SSL Certificates.
Hide errors from visitors: ✔

### Active Plugins (31) ###

Polylang: by Frédéric Demarle – 2.2.1
Add From Server: by Dion Hulse – 3.3.3
Akismet Anti-Spam: by Automattic – 3.3.4
Pinpoint Booking System PRO: by Dot on Paper – 2.6.0
Duplicate Post: by Enrico Battocchi – 3.2
Feedzy RSS Feeds Lite: by Themeisle – 3.2.0
Loco Translate: by Tim Whitlock – 2.0.15
Quick Featured Images: by Martin Stehle – 13.2.2
Redirection: by John Godley – 2.7.3
Related Products Manager for WooCommerce: by Algoritmika Ltd – 1.1.0
Smart Product Gallery Slider: by Shameem Reza – 1.0.1
WP Static HTML Output: by Leon Stafford – 1.9
UpdraftPlus - Backup/Restore: by UpdraftPlus.Com
DavidAnderson – 1.13.6

WooCommerce Customer Relationship Manager: by Actuality Extensions – 3.3.3
WooCommerce Customizer: by SkyVerge – 2.5.0
WooCommerce - Store Exporter: by Visser Labs – 1.9.2
WooCommerce bluepaid Gateway: by dev2com - JL – 1.2.3
WooCommerce PDF Invoices & Packing Slips: by Ewout Fernhout – 2.0.9
WP All Import - WooCommerce Add-On: by Soflyy – 1.3.6
WooCommerce: by Automattic – 3.1.2
WooSidebars: by WooThemes – 1.4.3
Yoast SEO: by Team Yoast – 5.3.3
WP All Import: by Soflyy – 3.4.5
WP Clone by WP Academy: by WP Academy – 2.2.4
WP Google Maps: by WP Google Maps – 6.4.05
WP-Optimize: by David Anderson
Ruhani Rabin
Team Updraft – 2.1.1

WP RSS Aggregator: by RebelCode – 4.11.1
WP RSS Aggregator - Excerpts and Thumbnails: by RebelCode – 1.10.1
WP Smush: by WPMU DEV – 2.7.4.1
MailPoet Newsletters: by MailPoet – 2.7.11.3
Woocommerce Gateways Xtension: by Thomas Huber – 20170202

### Settings ###

API Enabled: ✔
Force SSL: –
Currency: EUR (€)
Currency Position: right
Thousand Separator: 
Decimal Separator: ,
Number of Decimals: 2
Taxonomies: Product Types: external (external)
grouped (grouped)
simple (simple)
variable (variable)

Taxonomies: Product Visibility: exclude-from-catalog (exclude-from-catalog)
exclude-from-search (exclude-from-search)
featured (featured)
outofstock (outofstock)
rated-1 (rated-1)
rated-2 (rated-2)
rated-3 (rated-3)
rated-4 (rated-4)
rated-5 (rated-5)

### WC Pages ###

Shop base: ❌ Page not set
Cart: #11242 - /de/test/
Checkout: #7790 - /de/zahlung/
My account: ❌ Page not set

### Theme ###

Name: Vignoble Klur
Version: 1.1.12
Author URL: http://www.hkwebs.fr/
Child Theme: ✔
Parent Theme Name: Divi
Parent Theme Version: 3.0.71
Parent Theme Author URL: http://www.elegantthemes.com
WooCommerce Support: ✔

### Templates ###

Overrides: vignobleklur/woocommerce/cart/cart.php
vignobleklur/woocommerce/content-product.php
vignobleklur/woocommerce/emails/customer-on-hold-order.php
vignobleklur/woocommerce/emails/email-header.php
vignobleklur/woocommerce/emails/email-order-details.php
vignobleklur/woocommerce/emails/email-order-items.php
vignobleklur/woocommerce/emails/email-styles.php
vignobleklur/woocommerce/loop/price.php
vignobleklur/woocommerce/order/order-details.php
vignobleklur/woocommerce/single-product/meta.php
vignobleklur/woocommerce/single-product/product-thumbnails.php

The page I need help with: [log in to see the link]