feat(ui-next): Adds appearance dialog with theme presets and custom theme support (#6041)

platform/i18n/src/locales/en-US/AppearanceModal.json

@@ -0,0 +1,12 @@
+{
+  "Appearance": "Appearance",
+  "Theme": "Theme",
+  "Default Theme": "Tonal: OHIF Blue",
+  "Custom": "Custom",
+  "Custom Theme": "Custom Theme",
+  "Hide": "Hide",
+  "Apply": "Apply",
+  "Clear": "Clear",
+  "No valid theme tokens found": "No valid theme tokens found. Expected lines like --primary: 220 90% 60%",
+  "Paste your custom theme color tokens here": "Paste your custom theme color tokens here"
+}

platform/i18n/src/locales/en-US/Header.json

@@ -1,5 +1,6 @@
 {
   "About": "About",
+  "Appearance": "Appearance",
   "Back to Viewer": "Back to Viewer",
   "INVESTIGATIONAL USE ONLY": "INVESTIGATIONAL USE ONLY",
   "Options": "Options",

platform/i18n/src/locales/en-US/index.js

@@ -1,4 +1,5 @@
 import AboutModal from './AboutModal.json';
+import AppearanceModal from './AppearanceModal.json';
 import Buttons from './Buttons.json';
 import CineDialog from './CineDialog.json';
 import Common from './Common.json';
@@ -36,6 +37,7 @@ import USAnnotationPanel from './USAnnotationPanel.json';
 export default {
   'en-US': {
     AboutModal,
+    AppearanceModal,
     Buttons,
     CineDialog,
     Common,