add theme save override warning confirmation dialog

Author: reloxx13

assets/js/admin/themes.js

@@ -236,6 +236,15 @@ $(function () {
                 return;
             }
 
+            const themeExists = Array.from($select.find('option')).some((opt) => opt.value === name);
+            if (themeExists) {
+                const confirmMessage = photoboothTools.getTranslation('theme_override_confirm').replace('%s', name);
+                const confirmed = window.confirm(confirmMessage);
+                if (!confirmed) {
+                    return;
+                }
+            }
+
             const payload = {
                 action: 'save',
                 name: name,

resources/lang/de.json

@@ -921,6 +921,7 @@
   "theme_load": "Theme laden",
   "theme_delete": "Theme löschen",
   "theme_choose": "Theme auswählen",
+  "theme_override_confirm": "Theme \"%s\" wird überschrieben. Fortfahren?",
   "text_settings": "Text-Einstellungen",
   "toggleFullscreen": "Vollbildmodus umschalten",
   "translate": "Übersetzen",

resources/lang/en.json

@@ -927,6 +927,7 @@
   "theme_load": "Load theme",
   "theme_delete": "Delete theme",
   "theme_choose": "Choose theme",
+  "theme_override_confirm": "Saving will override theme \"%s\". Continue?",
   "text_settings": "Text settings",
   "toggleFullscreen": "Toggle Fullscreen",
   "translate": "Translate",