test: use cypress instead of protractor

cypress/support/index.ts

@@ -0,0 +1,22 @@
+// ***********************************************************
+// This example support/index.js is processed and
+// loaded automatically before your test files.
+//
+// This is a great place to put global configuration and
+// behavior that modifies Cypress.
+//
+// You can change the location of this file or turn off
+// automatically serving support files with the
+// 'supportFile' configuration option.
+//
+// You can read more here:
+// https://on.cypress.io/configuration
+// ***********************************************************
+
+// When a command from ./commands is ready to use, import with `import './commands'` syntax
+// import './commands';
+Cypress.on('window:before:load', window => {
+  // Fake that user is using its browser in german language
+  Object.defineProperty(window.navigator, 'language', { value: 'de-DE' });
+  Object.defineProperty(window.navigator, 'languages', [{ value: 'de-DE' }]);
+});