feat: 🎸 Update hotkeys and user preferences modal (#1135)

* feat: 🎸 Update hotkeys and user preferences modal

This feature fix incompatibility with existent hotkeys component and
adds user preferences modal back

Closes: #923

* Update preferences structure in store

* Hide window level section of user preferences

* Update modal to reflect current hotkey value

* Clone object with hotkeys before passing to manager

* CR Update: Extract hotkeys manager format code to manager

* Fix broken cypress test

* Use new modal provider

* Rename hotkeyDefinitions in hotkeyspreferences and use array as representation

* Update study test and remove unused styles

platform/ui/src/components/userPreferencesForm/GeneralPreferences.js

@@ -0,0 +1,17 @@
+import React, { Component } from 'react';
+import LanguageSwitcher from '../languageSwitcher';
+
+export class GeneralPreferences extends Component {
+  render() {
+    return (
+      <div className="general-preferences-wrapper">
+        <div className="col-sm-3">
+          <label htmlFor="language-select" className="p-r-1">
+            Language
+          </label>
+          <LanguageSwitcher />
+        </div>
+      </div>
+    );
+  }
+}